If it weren't for the slowdown, these would be the two main schools of magic in the game!
What about "Door"? It also provides acceleration, so air magic isn't inferior to earth magic; in my opinion, they are roughly on the same level...
P.S. By the way, regarding restoration, I would argue that this magic can't be considered one of the "main" ones, and I don't think it's worth saying that it can completely replace another...