From the super long title, I expected The Weakest Tamer Began a Journey to Pick Up Trash to be a mediocre standard-production anime, probably isekai, like we have seen numerous in recent times.
But the first episode instantly sets a great atmosphere and tone, substantiated by great visuals, animation, world depth, and story premise. While aspects or focus points change through the journey progression, the production quality never drops.
The "tamer" and picking-up-trash aspects are only a premise and hardly important to what is happening.
It's an adventure, a youthful exploration, stemming from hardships, with discoveries of the world and people. It's slow-paced - it reminded me of Mushishi (beautiful, world-depth, character embedded in world, slow-paced).
It's a great series that I can wholeheartedly recommend.
Have you watched it? What did you think?
JP title: Saijaku Tamer wa Gomi Hiroi no Tabi o Hajimemashita
Finished airing on 2024-03-29
The original text had 'he' where 'it' was correct. Which supports part of your premise.
They also merged a change request that changed those instances alongside 'they' instances. I don't know if the original author and denier was involved, but it's certainly important context missing from OP blog post.