Bard is just an easy class to put bad players on and then still be successful at whatever you're doing.

Bad players can still DPS while dodging, bad players can stand further back, and the gear -> DPS requirements on Bard are pretty low, so as long as you learn a really fucking simple concept (Apply DoTs, use buffs) then Bard is the easiest job in the game.

If you have terrible players then it's the best DD class for them to jump on.

Do note that a Monk or Dragoon will easily out DPS them though.

Think of it like, Bard is for FFXI/FFXIV veterans, and Monk/Dragoon are for WoW veterans.