Originally Posted by
Cilia
If you take away Red Mage's healing spells, it becomes a watered-down Black Mage.
If you take away Red Mage's damage spells, it becomes a watered-down White Mage.
The core of Red Mage's identity is that it is both a Black Mage and White Mage at the same time, just not to the effectiveness of either. Take away the ability to do either in any situation and it's no longer really a Red Mage, yeah?
... that's not to say they couldn't add something like "Black Mage Stance" and "White Mage Stance" to boost damage and healing, respectively, or have it branch like Arcanist does into "Scarlet (Black) Mage" and "Rose (White) Mage." Something like that.
Either way, we don't yet know what class Alisae is/was. Maybe Red Mage, maybe Rune Fencer, maybe Mystic Knight, maybe something new.