In 4mans, it not having threat will make u ride the line in threat vs DPS.
But for endgame its perfect, as a WAR and DRK need enemies to hit them to do more DPS. (More so WAR than DRK now that blood price is grit onry)
So you dont want to pull off of your other tank when u need to quickly dispatch trash mobs mid savage raid.

In A12S, I would rely on blood price to spam abyssal drain on the adds, but my WAR OT would pull some of the adds off me with overpower, leaving me with less MP generation. (overpower is waaaay more threat than abyssal drain) So i had to use more unleashes before abyssal drain.

My point, this is balanced for endgame as far as I can tell.