Just to be the voice of "what if?"
Take CNJ and DRG for this example. Large portion of CNJ "cap" objective is amount of HP healed, which is fine when the event takes place as intended with lots of people. DRG "cap" is purely damage dealt. The DRG will hit their cap almost every time, while the CNJ cap may not be met if there simply aren't enough people around taking damage. This could be due to an NA playing at peak EU time or something. How do you balance that, then?