Just personal opinion, perma death is cheezey. You might as well just put a more realistic stop watch or enrage on the fight. If boss can't die in 10 mins enrage or timed out. I am not even sure if Perma death should be in very endgame content. And if it is in content it should be in a last phase 20% or less HP.
The other changes are AI/trust issues. Not much they can do about it. If that is the best the ai can do. Stone Vigil last boss nerf is a little funny. In 2.0 when plds had cure you could solo it from at least 50%.
