It's more about risk. BLM can do their massive damage from a distance, and their positioning is never an issue on survival+damage. Dragoon need to start off our rotation on the side, then move to the rear, all while dodging AoEs, and staying out of cleaves. While we're moving out of a red zone, you're still lobbing fire/arrows. We need higher damage to compensate for those moments, when we aren't hitting anything.
During Primal fights, melee tend to drop first. Because DRG/MNK are in very dangerous spots all the time. With the right rotation, BLM can out DPS us. Yes we do massive damage, but its almost not worth the risk. DRG/MONK are borderline liabilities. If it weren't for our LB, there would be almost no reason to take us along. The damage increase will make it more worth using melee DPS. Which should do more damage than ranged, simply do to balance.
We also have jack for AoE. While BLM can do massive damage in either situations.
It's not just about straight numbers, it's about the utility.
