I agree in the desire for this game to not get stagnant. That said, there's only so much things can get shaken up before you essentially have another game. Wanting the overworld to suddenly have elemental affinities to then force a job like BLM to use noncanon spells is where I think that line is. Noncanon because this is XIV first and Final Fantasy second in my eyes; and of course, on Hydaelyn black magic encompasses the elements of ice, thunder and fire in contrast to white magic's earth, wind, and water.