Explain to me why spending two buttons on one available action does you any good? It's not paranoia. It's just common sense. The same kind as might say that "mate... adding 0 still gives you the same number... no matter how many times you do it."
Fire IV holds no purpose whenever Blizzard IV does. Blizzard IV holds no purpose whenever Fire IV does.
And no, a switchboard still does not apply a single toggle to separate switches. They simply switch the same switch from upward... to downward, "on"... to "off".