I miss Thaumaturge before it was changed to be the base class for Black Mage. Thaumaturge was based around light and dark (astral/umbral) with debuffs, DoTs, heals, buffs, etc. It kind pf felt like a Dark Knight or Red Mage, but pure caster rather than melee. Conjurer was the elemental caster that was primarily DPS.

Once the two classes were altered to be suitable for job upgrades, their roles were changed and Thaumaturge became completely different. Conjurer took the healer role. It's fine as is now, but I miss what THM had since all of those spells and skills no longer exist.