"Hope can turn into despair in a heartbeat."
R.I.P Chester Bennington 1976-2017
Essentially, they are Diablo Rifts in WoW, step 2.
Nuff' said to be frank. The whole ideas' weaknesses did not change. Repetitiveness of Rs and GRs doesn't really hurt in Diablo because they are easy, casual content with high and frequent reward. In WoW, either you make pixels your life goal and tell yourself M+ are OK, or you stop doing them the moment you can do something else without a noticeable penalty.