This I think speaks a lot to the MMO-ification of CRPGs these days, just inflate your characters stats and then make the mob's hp goes up to match it, while the mechanics never really change. This was all I could think about with DA:Inquisition which was just "watching cooldowns the game"...
I wouldn't say MMOs did that. It was happening before 99.
I'm sure HP bloat was a thing before MMOs as was the tank-damage-healer trinity, but MMOs started wagging the dog on this one I think, because they were so popular and because they're designed never to end meaning your characters are spending most of their lifetimes number chasing, so power creep becomes a feature instead of a bug.