Lorewise, are Time Mages viable? [Discussion]

[Masekase_Hurricane]

While not a common job it has appeared in the series a total of 3 times: Tactics, FFXVI, and Bravely Default:

Wow you must be a real life time mage

usually Aero, Stone, or Water. Now while I cannot state as to why they gave them these 3 spells,

Well my guess is they draw aether from their surroundings i.e trees which tap into the planets aether. Trees need oxygen(Aero) stone(earth) and water to survive, also a tree is shown for their icon :P