any class that brings utility to the group should not have equal damage as a pure bred DPS class thats just basic game design of balance. There's nothing to argue, yea they do less damage, but they help the group survive or buff other players. Don't forget MCH and BRD are Ranged classes, from that mechanic alone they have an advantage on certain boss fights, this is known if you ever played any other MMO, Melee dps always have the disadvantage. BLM is the exception because they cannot move while casting, which in turn hurts dps in a heavy moving fight.