Nothing. As far as endgame is concerned, though, the monsters will be balanced with Monk/Warrior/BLM/Dragoon DPS in mind. While Archer might come close and beat PGL/LNC/MRD DPS the same won't happen with Jobs because they are better DD's. Archer's Job on the other hand is Bard which isn't even designed to boost ARC's DPS in comparison to rest of the Jobs, but to support them.
