I played with it all of Legion, and it was manageable. Great in raids, terrible anywhere else, but still playable.
BFA was a different story.
The mechanic is impossible to balance in its current iteration and I’m going to be playing my Death Knight so I’m no longer strapped to this abomination of a spec that will never be fixed. Good luck boys, but it doesn’t look good for you.
Oh, and remove void form please so I can actually be useful in other forms of content that isn’t just boss fights that last 5 minutes.