Melee has to hit all positionals perfectly, avoid getting hit by the melee range AoEs that will likely kill them. SAM has no utility whatsoever, NIN's opener and burst can be as complicated as MNK (if not more so). BLM's major weakness, standing still, has been nerfed through mobility skills to the point where it's no longer a concern for them. 2 Charges of Triple Cast = 6 instant spells, Swiftcast = 1 instant spell, Thundercloud/Firestarter procs = 2 instant casts, Foul/Xenoglossy is instant, Aetherial Manipulation is on 10s...BLM doesn't really have the crutch they once had.