Tanks, specialized in Vitality, make a defensive wall.
Healers, specialized in Mind, heal.
Mages, specialized in Intelligence, drop the cosmos.
Fighters, specialized in Strength, hit hard.
... Bards, specialized in Dexterity, heal?
... Ninja, specialized in Dexterity, will probably hit hard?

It seems like the method a Limit Break gets decided could be standardized a little better than simply by class. Could it instead work that it's decided by the highest attribute-- once modifiers have been removed?--upon initiating the cast? This would ensure healers can't Cleric Stance into Meteor, while giving our DEX-heavy DPS their own useful limits.