I think the aspect of 4E which informed its design (that was not present in those other games) was the utter dominance of World of Warcraft at the time.
That, in turn, had an element of play balance between classes that D&D had never had before. There, the point was to balance the party vs the monsters, not members of the party vs each other -- as was one of the balancing factors inherent in PvP play in WoW class design. Diablo influence? Same thing.
I would not pooh-pooh that aspect of things too much. It always in vogue and garners much grognard street cred to dismiss 4e as "video-gamey" with a sneer.
Yeah, well, we might get some of this back in future editions, too. The game is bigger than any of us (it's bigger than WotC, too). And these things can have a rhythm.