Bard DPS isn't higher than melee DPS. Bard DPS caps out sooner, stronger, in the early endgame like Titan. Once people get Relic +1 and ilvl 90 pieces, Bard DPS falls behind melee DPS. Take an equally geared Bard and an equally geared Monk/Dragoon with the same Skill in ilvl 90 gear, melee will win that DPS every time barring fight mechanics.