Remember, you being in a low level dungeon is not for the benefit of you - it's for the benefit of the low level characters. Yes, it becomes boring, and if you didn't build your macros right, it can really screw up your rotations. But you're already going to be a better player in a low level dungeon just by sheer virtue of your gear and your experience - giving you the full rotation on top of that would be massively overpowered and unfair to the new players in your party who don't have access to anything like that.

This is actually the biggest concern I have about the new jobs starting at level 30. What abilities are going to be available below that if there is no base class?