A perhaps more useful tradeoff would be if one could disable a subset of CSS/JS with a simple switch in the settings, so e.g. transition animations are skipped

A perhaps more useful tradeoff would be if one could disable a subset of CSS/JS with a simple switch in the settings, so e.g. transition animations are skipped but the webpage is otherwise readable. I think I have yet to see a webpage that uses animations in a way I enjoy, even when they’re smooth. (The same goes for most PowerPoint transitions and window manager animations...)