The_Vampire

The problem was that I underestimated just what a vast gulf of time 15,000 years is. For one I was struggling to fill in all that time with events

Then don't fill in all that time? You can leave periods open or unmentioned, you don't need details everywhere.

for two I realized that this knowledge preserving group would have had to existed for way longer than I was originally envisioning

Depending on your depiction of Elves the effect is the same (provided the group is Elves) because they're often predicted as just slower/more leisurely in their approach to life (although I'm not sure what you mean by the statement in the first place, because something being older than you intended doesn't sound like an actual problem).

Not only would they be older than the Jewish religion, they would be older than ancient Sumer. In fact you could take the entire history of the beginning of the Sumerian empire to the present day and fit it into that span of time twice over.

You could, yes. Here's the thing: history doesn't have to happen. You are the worldbuilder, you can easily say there was a long period of nothing at times, or a period where record-keeping gets mixed-up/distorted/unreliable (but earlier periods still manage to maintain their connection more readily, this has happened several times in real life if you care a lot about realism).

In the end I had to invent empire C, which refurbished some of empire B’s infrastructure before collapsing themselves, as the actual origin for the knowledge keepers. And even with that I still had to move the timeline up by thousands of years.

That seems entirely like a 'you' decision. There's nothing here that sounds like a problem long-lived species caused. You could've easily just said empire B lasted longer or managed to revitalize itself temporarily (as the Roman empire did and the Byzantine empire did many, many times) or any other number of solutions like a golden age, a period of upheaval and warfare with another empire that empire B ultimately wins, or you could just leave the entire extra period of time unmentioned/undetailed. None of this seems relevant to long-lived species though, since as a long-lived species you can just drag out their periods of history (a good ruler will be a good ruler for a lot more years and their nation is more resistant to change just because people with the ability to change (or not change) things stick around longer). That would even be very realistic for a long-lived species.

The problem with that is that it would really change the dynamic of how non-elf civilizations would develop. Unless the elves are extremely insular, and even then. How do you have a plotline involving the player characters needing to delve into an ancient tomb in order to discover whether or not the current ruling family are the legitimate heirs of the kingdom when you can just ask an elf? How does the world get into that situation in the first place when you can just ask an elf?

Do you trust any old man you meet on the street? If an old WW2 veteran suddenly starts yelling about how he met Hitler and totally knows the names of every member of his administration (thereby potentially allowing you to hunt down some war criminals), do you just believe him at his word? For one, senility can affect Elves just as easily as any other race, and the effect would possibly be way worse given they can be senile for much, much longer. For two, Elves don't necessarily have a better memory than Humans. As time marches on, their memories can distort, be forgotten, and fade. For three, hostility and lies exist. Even if your kingdom is egalitarian and mixed races, individuals have their agendas. The word of a person is extremely tenuous, and you could easily have Elves saying opposite things. One Elf says the hero is the heir to the kingdom, but also this Elf happens to be a close family friend and has been for generations. Another Elf says the hero is not the heir, but also this Elf happens to be the godfather of the person who would be king otherwise. You can include any number of Elves and just split them into factions because popularity is fallacious and not real evidence.

And, as an alternative point to your earlier point, Elves being around and supportive would mean the empire lasts longer. The conditions for major upheaval like a succession crisis would be rarer specifically because an Elf could be around to make sure there's no issues, thus solving your issue of needing an empire C... or on the other hand an Elf could make things a lot worse if they liked and people trusted them. Elves don't have to be good-intentioned.

And a fourth point, Elves may not care/notice at all. If the Elves are insular and live in the woods they're extremely unlikely to bother remembering the Human king, after all he only lives like a scant 100 years at most so why even know his name? Barely an associate. Even if there's good relations, Elves could easily see Humans as 'all the same' i.e. it doesn't matter who's in charge and they'll just support the least-likely to cause problems (even if that happens to be the wrong heir or someone who would be bad for the humans).

I could probably think of a lot of other ways to solve these issues, but point is when worldbuilding you can solve a lot of problems with a lot of different solutions. Yes, you can just get rid of long-lived species if you like. You can also modify the world to match the fact near-immortals exist and I don't think it's that hard. It's your decision, ultimately, but there's a lot of ways to solve it.

I don't think that necessarily takes away from the grandeur of something. If you want something truly ancient and out-of-touch, you can easily just set it 15,000 years ago instead of 1,500 and no player will bat an eye or even notice, and the elves' lifespan gives an easy 'this is why they remember and are still more knowledgeable with this ancient civilization than other races'.

It's also not any less awe-inspiring to have people who lived in an important time period. We still have living veterans of WW2, and WW2 is no less important or intriguing (as evidenced by the number of historian hobbyists who love to talk about all the details of WW2).

It's to keep design space open and to minimize developer work.

Let's say we decide to keep an overperforming gun. It does all the things. It has all the ammo, all the damage, all fire rate, all the reload speed. Now, all future weapons have to be made with that as a consideration. Why would players choose this new weapon, when there's the old overperformer? The design space is being controlled and minimized by the overperformer. Players will complain if new weapons aren't on the level of the overperformer.

Now, let's say we have ten weapons with one clear overperformer. Now, we can either nerf a single weapon to bring it in line with the others, or buff nine weapons to attempt to bring them up to the level of the overperformer. Assuming the balance adjustments of each weapon are the same amount of work, that's 9x the effort. However, if we assume we do this extra work to satisfy players, now we have ten overperforming guns and players find the game too easy, so now we also have to buff enemies to match. However, the game isn't designed to handle these increase in difficulty. Players complain if we just add more health to enemies, so we have to do other things like increase enemy count, but adding more enemies increases performance issues. It's a cascading problem.

I consider nerfs a necessary evil. It's absurd to ask developers to always buff weapons and give them so much work when they could be developing actual additions to the game. Sometimes, a weapon really does need a nerf.

Having read your article, I contend it should be:
P(arentheses)
E(xponents)
M(ultiplication)D(ivision)
A(ddition)S(ubtraction)
and strong juxtaposition should be thrown out the window.

Why? Well, to be clear, I would prefer one of them die so we can get past this argument that pops up every few years so weak or strong doesn't matter much to me, and I think weak juxtaposition is more easily taught and more easily supported by PEMDAS. I'm not saying it receives direct support, but rather the lack of instruction has us fall back on what we know as an overarching rule (multiplication and division are equal). Strong juxtaposition has an additional ruling to PEMDAS that specifies this specific case, whereas weak juxtaposition doesn't need an additional ruling (and I would argue anyone who says otherwise isn't logically extrapolating from the PEMDAS ruleset). I don't think the sides are as equal as people pose.

To note, yes, PEMDAS is a teaching tool and yes there are obviously other ways of thinking of math. But do those matter? The mathematical system we currently use will work for any usecase it does currently regardless of the juxtaposition we pick, brackets/parentheses (as well as better ordering of operations when writing them down) can pick up any slack. Weak juxtaposition provides better benefits because it has less rules (and is thusly simpler).

But again, I really don't care. Just let one die. Kill it, if you have to.

To note:

Revenant and Zephyr can both survive using their unique abilities to any level. Zephyr has a harder time of it and they both need casting speed for real safety, but they both can do it (plus Zephyr gets all her other cool tricks, CC, and damage spreading tornadoes). Garuda can also get away with spamming her 4 for invincibility (and 3 for energy) using Molt Reconstruct + shield-gating, and of course there are invisibility frames. Loki with Safeguard Switch is nearly as invincible as Revenant and any invisibility frame (Voruna, Ivara, Ash, Octavia) with rolling guard can survive pretty well even when allies are getting enemies to fire straight at you (at least long enough to reposition out of harm's way or kill the enemies).

If you want to facetank, slotting in adaptation is extremely useful, in addition to Arcane Blessing and Arcane Double Back. Healing is important, though, so I also recommend subsuming gloom, which is the ultimate subsume for HP tanking since it provides tons of CC in addition to lifesteal, and there really isn't any better source of super-consistent healing for most frames. You can get to level 900+ with all of this, especially once you add in umbral mods.

I would also note that Revenant is the ultimate facetanker, but doesn't use HP for it (Mesmer Skin is my favorite ability in the game because it lets me chill even in Steel Path). All he needs is casting speed (recasting Mesmer Skin leaves you temporarily vulnerable and is slow enough that a shield-gate won't necessarily keep you alive, but casting speed will fix that), energy (he's not energy-hungry as long as you don't slot in blind rage and don't use his 4 (though there are builds that work with his 4 rather than abandon it)), and ability strength (though even unranked and with no strength mods Mesmer Skin can keep you alive better than a normal shield-gate build provided casting speed). As a word of warning, a few rare things (mostly barrels/environmental damage) do bypass Mesmer Skin, but Mesmer Skin will keep you alive regardless because you literally cannot go below 2 HP with Mesmer Skin active (though you will assuredly die when you attempt to recast it if you don't have your shield up).

As always, though, the best method of defense is offense. You're going to have trouble taking damage if you just stand still, no matter how much EHP you get. It's important to have weapons that can clear rooms in seconds in Steel Path because you will only have seconds to clear before you die or have to bother with surviving in some way (like refreshing your shield).