This is probably part of the plan of making classes easier to play. In HW, you were required to stance dance, if not spend most time in damage stance to be optimal. Tanks would generate so much aggro that they could spend most of the fight in damage stance doing their damage combo with no problem. On the other hand, that was something reserved for raids/ex trials only. A common player could spend a whole dungeon in tank stance and that would not be detrimental to the run (maybe spending 2 or 3 extra mins, but who cares?)

I don't see VIT boosting tank damage anymore because death sickness doesn't reduce VIT. That means tank would still deal max damage while all the others are penalized for dying. A solution to this would be either put STR on tank accessories, or make tenacity meaningful

If nothing happens, I guess the main tank will be stuck in tank stance doing aggro combo to keep up with DPS, especially the super OP samurai