Seriously. The hotkey limit is nowhere near being reached, if a couple new skills makes this game overly complicated for you then an MMO may not be the right type of game for you.
Not to mention traits are important. New abilities can replace older ones and cause significant rotation changes.

You may lack the creativity to think of how new abilities will work, but thankfully, it's not your job to design the game.
Not that SE has shown any significant creativity in the past few patches, but the point stands on principle.