lol i understand your concern but for lore reasons (maybe? since 1.0ish? someone pls correct me if im wrong) that dragoons were made the tanky melee, they have higher DEF at the cost of slightly lower MDEF compared to monks who were given average def/mdef armor. and it's been this way for as long as i can remember so i doubt SE will touch it.

edit: also if ever (if ever!) samurai would be introduced as DPS, i can probably see them going the way of NIN/MNK with SAM armor initially sharing maiming dungeon (not AF/etc.) gear with DRG since they're both tanky