Mmmm, that's certainly a good point. I just wonder about the fire cone though. Seems like it could be a very powerful thing to have handy when you're limited on options for fire attack spells in game and don't feel like always having to rely expanding into more memory to stack higher level fire spells and the AP costs to use them in combat. Could be the difference between making one attack or two. And the only time the 20% makes up for an entire other attack is on the really high spells.
