None of the dungeons require mass grip, or grip, but it's a quality of life and convenience thing, there's tons of places you can CAN easily do multiple groups that aren't feasible for other tanks to round up without organised effort. There's also a lot of immune to stun/interupt/pushback mobs that grip still works on.
On a different track, thinking about it pisses me off again but DK can also just dump there death and decay on the ground for a big slow but they removed it from thrash.
If bears had kept rage of the sleeper and thrash slow into current content they'd be fine but not OP.