I don't see why we are not tanky, well at least as Demo. I have over three times the healing of the next hps on the healing list through a near passive heal and absorb, thats before even casting Drain Life which unbuffed for me is 6 ticks of 81k over 4s.
The only time i am not tanky is if i have to move for an extended period of time, dark pact is for that. But with my boots i don't even need to take Dark Pact, doom/tap a couple of times will almost always proc my cast on the move and then drain life.
Before the change i barely needed to cast dark pact anyway, now with our mobility back i have even less need for it.