Blm has to be precise and rdm gets to faceroll content for same numbers and extra goodies. I played healer as rdm in full dps comp for potd and was able to do it fine.

Smn and blm can't play healer or tank, same problem we had with 3.x warrior they could self Heal, tank and do insane dps with cleaves. This mmo has the trinity system use it.