Is There a Reason Why Conjruers and White Mages Don't Use Water Spells?

[Ghost_of_Ebina]

They really need to re-introduce element-based damage / defense as a part of the game mechanics to make sure this plot / setting element makes sense.
It would obviously be a nightmare -- having to add element-based data to every existing enemy / equipment / skills.
However, that level of complexity will destroy the currently monotonous skill / job optimizations.

[Shurrikhan]

They really need to re-introduce element-based damage / defense as a part of the game mechanics to make sure this plot / setting element makes sense.
It would obviously be a nightmare -- having to add element-based data to every existing enemy / equipment / skills.
However, that level of complexity will destroy the currently monotonous skill / job optimizations.

While you can certainly involve elements, an actual traditional elemental strength/weakness system basically exists only to rotate a reduction of choices, making it so only certain jobs are viable (and others barred) and only certain parts of even just those viable jobs' toolkits actually see use. While perhaps more technically 'complex' in itself, it usually results in a significant net loss in complexity for the game overall.

Moreover, do you really want up to some 8 sets of gear just so you can play optimally via Wind Resist/Penetration gear for Barb, Fire Resist/Pen gear for Rubi, Umbral Resist/Pen gear for armored cyclops man, etc.?