> Also, I think a lot of people would be happier if web apps exposed settings like zero animation

This exists as a browser setting, it's called "prefers-reduced-motion", an example usage in my code: https://github.com/mickael-kerjean/filestash/blob/master/pub...

That is very not-enough, as it is literally "prefers reduced" but i need (not prefer) zero animation. And yet with this present several years already websites just happily ignore the setting. So i believe this should be honored by browsers which should just stop animating transitions. But then there is the other elephant in the room (JS anims).