As bourne has said the dmg on a dummy of BLM is still low and that is because overall their potency /cast is something that other jobs easily attains not to mention they have a way to burst out more dmg while beign less adffected by movements.

While I agree that scathe should receive some buffs because as it stands is effectively useles it doesn't change the fact that to function as a turret dmg dealer the reward should be much higher than what we have right now

Also dungeons aren't that hard and besides for deep dungeon style RDM is still a better pick