Yeah, that's what bothers me. Feels like people romanticize pre-Musk Twitter, when in reality, its always just been complete garbage. Musk's Twitter is certainly worse in some ways, though that isn't saying a lot.
Overall, Twitter just sucks. Use other platforms where possible.
You can easily change launchers on the Shield and remove all of Google's nonsense through ADB as well though, unlike Amazon who locks down the OS very tight. Plus like another commenter said, you can just flat out install LineageOS and you're good.