Isn't this class trinity a bit dated now?

[DPZ2]

So we have this nooby friendly Trinity of Tank, Healer and DPS. Which I get it, its there to kinda break people into the system of MMOs but aren't we past that now?

The Trinity isn't there to introduce people to group combat in an MMO, the Trinity is the group combat premise in an MMO. It is there because you will always have people of disparate abilities in the game and predictability of outcome in group combat requires it.