Speaking about Vault... if they added 100% invincibility (from beginning to end of the animation), would that make it broken or something? I've always wondered that.
I can't see how. It's even more timing dependent than SS. Honestly the way Vault works makes it so much less useful than it should be. Besides the fact that it doesn't break CC (which forces SS to be a permanent resident on your hotbar) and doesn't give you any invuln frames, it doesn't even navigate terrain well. If it could backflip over walls and down at least medium size terrain level differences it would be a thousand times better.