Hybrid roles cant really work in this game.

Why would I bring a gimpy heals that can kind of dps? Why not leave the healing to a true healer and bring a dps that can focus on dps only?

Bards are mostly included in progression content for Ballad. Once things are farmed, most bards switch to pure dps and either dont play songs other than Foe (not needed), or enter the instance as another job.