I'm not gonna try too hard to explain this, but right now there are only 2 healing classes and both tbh are efficient but terribly boring.
Thats why I would pay a million dollars to see the new Healer class, to be a Songstress!!!
Imagine having a Stance/Song for different situations?
Regen requiems that help hp over time while increasing Defence and Magic resist stat?
Songs that increase Health of your team for a certain period of time?
Songs that increase TP pools?
Even offense would be amazing being able to constant Aoe Blind foes around you or slow foes around you constantly as well!
Offering Determination debuffs while granting your teammates an increase in theirs?
Sure Songstress follows a similar path as bards, but imagine how jazzy it would be to sing your teammates to victory???
Not to mention how AWESOME The gear would look!
http://http://finalfantasy.wikia.com/wiki/Songstress