I can see what they are doing with how they split the elements between Con and thm.

Traditionally in offline FF, whm generally gets Aero spell. Blm traditionally gets Fire, Blizzard, and Thunder. Water and Earth spells sometimes showed up but they were usually learned much later on and weren't used as much as these three basic ones.

So it seems they are trying to make it more like the tradtional FFs which I think is pretty cool. Although I'd love to hear how they are going to clear up this from a lore standpoint, lol.