The thing that separates FFXIV from FFXI is that there are actually 2 elemental wheels in FFXIV, not one:

Fire > Ice > Wind > ...

Lightning > Water > Earth > ...

Enemies are essentially weak against the element that dominate theirs, they're either resistant to or absorbing their own element, and they're resistant to the element their own dominates. All 3 elements from the opposite wheel will give normal damage.

That means that in all cases, both CNJ and THM have spells that will AT LEAST deal normal damage if not critical