What if casters had element resistance debuffs?

[HyoMinPark]

I doubt they'd even need to use all 6. Ice and Water for example have no real merit. Black Mage uses ice to recharge and Hyoton is crap in PvE, no one else uses Ice beyond that. The only Water attack I know of off hand at least is Suiton, which is mainly used to proc Trick Attack. Earth is used mostly by White Mage with Red Mage using it on Verstone procs and Ninja using it for Doton, so Earth can afford to be ignored here. That leaves Fire, Thunder, and Wind as the most reasonable resistance debuff additions.

And compared to the physical resistances down, which benefit the entirety of most melee and physical ranged rotations, specific debuffs will only benefit a portion. It would just be easier to do "magical resistance down" if casters were insistent on wanting their own damage debuffs. There's no need to add three more specific debuffs that won't benefit the entirety of a rotation where as a general resistance down debuffs will.