I don't think "animations" fits here. Well-implemented CSS animations are generally fine (though this is in and of itself a high skill to do well, I think). If

I don't think "animations" fits here. Well-implemented CSS animations are generally fine (though this is in and of itself a high skill to do well, I think). If you're still driving animations with pure JS, you probably need a refresher in modern web dev. Diffing a VDOM might fit here, but that's not really GUI-specific - just a combination of your earlier points.