Mostly because we're constantly trying to play the "keep away" game from ranged DPS who just run away spamming their moves. Hence why you se mostly BRD/MCH/BLM/SMN. You'll see some DRG/MNK/SAM sprinkled in now and then. Meanwhile I play my favortie job RPR and i'm about worthless cause half my kit is locked behind Immortal Sacrifice stacks and my LB gives Hysteria... so when I use it, I shoot myself in the foot cause they run away from me and I have to catch up to them.