Comment by pcwalton

> We were writing an animation system in Bevy and were hit by the painful upgrade cycle twice.

I definitely sympathize with the frustration around the churn--I feel it too and regularly complain upstream--but I should mention that Bevy didn't really have anything production-quality for animation until I landed the animation graph in Bevy 0.15. So sticking with a compatible API wasn't really an option: if you don't have arbitrary blending between animations and opt-in additive blending then you can't really ship most 3D games.