I think the 'you don't have to be max level' narrative is quite disingenuous.
Yes, the game doesn't offer anything significantly different at max level compared to what happens before that.
But having access to all your traits, your cookie cutter build, the best gear, all the dungeons and all the zones (and not being kicked out of dungeon/fractal groups is also nice) kind of is a game changer.
I despise levelling in every MMO and at this point I just use my tomes for 40-80 because it's painfully tedious and I hate being artificially barred from content.