damage meters (read:addons) are a good thing, and RP can be brought back in the game. The difference here is that different kinds of players like different things. Some players like to compete with others, some players like the story. WoW used to be somewhere in the middle, and if they wouldn't "pick a side" the game would end up being dead.
The only thing that stops class RP being brought back into the game are community, in sense of a chain "more RP >>> less balanced game >>> community being outraged over lack of balance"
I think "world first" should be left out of conversation, it's such a bullshit thing from the very beginning. It's irrelevant thing that was picked up by players. Does dark souls or any other game stops being enjoyable or relevant when someone reaches and kills last boss first? No, that's why world first kills, while being impressive feats of strength, are irrelevant for the playerbase.