I agree that as the questable af weapon it makes sense for klimaform to be sch only. Arguing over it is silly, it doesn't rightly matter how useful it is or is not, or if its a spell or not. Hell the real argument should be to turn blm, rdm, brd, etc af weapons into marginally useful spells as well.
But who really cares? Macc isn't really a problem for anyone right now, and blm already has ES if it needs macc. The duration is so short and recast is so long that I barely even remember to use it as a sch main with empyrean feet, so if someone levels sch and goes through the quest finds a use for it, I don't care.