I hate how this question became relevant. Either you DPS as dragoon like everyone and do normal damage, or not and do inferior damage. I screwed up a fist of the father trying to DPS as monk. I was on 0.5 and i didn't do enough damage, the other one was lower by a large margin. Doing the positioning and all cd on cooldown.
Everytime i heal for expert it's dragoon and black mage. It happened once last week i got bard and black mage.
When everyone plays the same class, there is a reason.