Seriously, aren't you tired of running around in some minor variant of the same olf fleshbag?

Wouldn't you rather your Warrior of Light was a full-body cyborg (perhaps like Briareos Hecatonchires of Appleseed) or a sentient machine (perhaps like the ones in Endwalker, but without the mental illness)?

Changing your class wouldn't involves just changing you clothing: you'd be swapping out body parts!

[Note: I firmly believe this will never happen. But it's fun to think about.]