There are probably classes in Final Fantasy's job history they could explore, I know Time Mage is brought up.

I personally would have loved an offensive-based star-magic class. Watching AST's comets do almost no damage is a bit sad. I want spells like Meteor, Stardust, and the like.

Something like Elden Ring's Gravity/Stars/Moon spells would be something I would enjoy. Unfortunately too much overlap with with AST so probably would never get this.