3.0: Elemental Weakness/Resistance?

[HakuroDK]

I want a BLM more like on the left. It's actually a lot simpler than the graphic looks.

If enemy is weak to Element X, use Element X.
If enemy is resistant to Element X, use something other than Element X.

Just follow the Element Wheel. Easy peasy.

I mean hell, why even bother giving THM/BLM elemental spells if they're going to inflict non-elemental damage? There's no point. Hell, you could replace them with a spell tree that progressively summons more rubber chickens and another that progressively summons more hats, and it'd make just as much sense.