Love this comment. In general I think developers shouldn't change the height of things, animation or no. If you're using vh then the page shouldn't have a scrollbar at all. You should only ever use it to fit your whole UI on one screen.

I actually can't imagine any other use for vh that isn't related to screenjacking (giving you a "full screen experience" mid-article) or scrolljacking (changing how the page scrolls). Parallax effects, maybe? I like the current limitations.