A lot of this is probably going to change when the Job system is in place. A Japanese interview confirmed Bard as one of the Jobs being added, and the only really likely Class it would be linked to is Archer, considering the other jobs that have been revealed. I think while a Lancer or a Pugilist might not be capable of putting out enough damage to warrant the extra damage they take compared to an Archer, I think a Dragoon or Monk *will* deal substantially more damage than an Archer or a Bard. It will shift their focus from a generic solo build with balanced offense and defense, to a party-based build focused much more heavily on damage. That might also come with abilities that make them more useful as a DD in dungeons than an Archer could be.