Logic behind the DPS classes?

[SpookyGhost]

Monks hit pretty hard, pretty quickly.

Lore-wise the combat for each job makes sense. Monk quickly whittles away at the monster, BLM has massive bursts of damage at a relatively slow rate, SMN infects diseases and festers them which is why they're DoT based, DRG is burst heavy because they need to kill dragons quickly (especially with their jumps, one of the keys to their burst rotation), BRDs... pew pew, and Ninjas are a mix of burst (ambush) and quick attacks (stealthy).

Though SMN is really weird in that their connection with the pets isn't the basis of the job (it's more like an Arcanist learning how to summon small aetheric versions of Primals and that's as far as that went), the rest are in line with what they actually do.

[Jonnara]

DRG is dead most of the time because Ishgard can not win the war with the dragons for love or money (especially with their elusive jump, one of the keys that gets them falling off the platform in Titan EX)

Fixed it for you about that dragoon part. See above