At this point in the game, "rushing" is not a valid argument.

[Reynhart]

The problem with "rushers" is this:
Let's say the game has 200 quests: You can't skip 190 of them and complaining about the lack of quests.
The same is true for dungeons: 10 or so dungeons, spreading from level 20 to 50. You can't purposely skip 9 of them and complaining about the lack of dungeons.

And I suppose people are smart enough to understand why content is spread on all levels and not only for endgame: Because not everyone is level 50 one month after launch.

I fear for the next step: 5 fighter classes, only leveling one, and complaining that the game lack combat variation...