I'm top DPS like BRD/MCH in DF too...but with my static, my mates are good players, I mean, at the same skill lvl, BRD and MCH do less damage, if You are top DPS with your static, I'm sorry, but your mates are not doing the best with their jobs.
Every player with BRD or MCH like main job does not need to have a second job if He does not want it, but If You wanna be useful during every encounter, It's a good idea have other Jobs and help as mach as possible to your team.
For instance, during A3, my static does not need support, then I play like NIN, and when I'm gonna use Trick Attack, I used to notice that to my mates for max damage output, It's just an idea. Like BRD or MCH I used to do less damage than NIN, like 10-15% and Trick Attack used to be a bit better than Foe or Hypercharge...this means more damage from my part and more damage to my party. Boss is killed quickily and token farm turn a bit smooth just changing my job :).
