I think we have too many classes, making the theme behind them too thin.
I'd be ok with Warrior, Bard, Mage, Cleric and Rogue.
- Rogue are exploration/social focused. Ranger can fall in this category.
- Warrior is your usual bruiser but also includes the light-armored skirmisher usually given to the rogue. Paladin and Barbarian can be subclasses of warrior.
- Bards cover non-divine druidic and fey magic, with a good side of status effect and time magic. These are you FF's Red Mage.
- Cleric are the sacred caster, covering the FF's white mage trope, with some domains giving access to more martial proficiency. The more divine druid stuff falls under the more primal domains (nature, storms, moon etc)
- Mage covers arcane casters, both learned and innate: school specialist, dragon-mage, demonologist, star-seer etc