This was a theory that was passed around a while back and I wanted to bring it up again because it made a lot of sense to me and to the other people I shared this with: if Bards (and possibly by extension all other non-magical ranged DDs) had access to a damage-dealing limit break, what's the point in bringing any other damage dealing job? They deal respectable damage, can do it from a safe distance and while moving; all the points that people brought up when asking for Bard nerfs or buffs to the other DDs. I believe that this is mainly why Bards were given the healer Limit Break (on top of it making more sense than calling down meteors, which Casters do, and melee DD being the ones to get the single-target LB).
Now, while I do like the idea of more classes/jobs following in the footsteps of Bard, I like to call them Supportive DDs, I don't think they need any special classification. They're all DDs at heart, so they should just be called what they really are: damage dealers, even if they can contribute a little more to the success of a party than straight damage output.