Indeed, as pointed out before: It's very imbalanced. being able to escape melee enemies by flying away and then casting fireballs on them from the sky.. does not really sound as balanced as a dual wilding short sword user in the same situation without levitation.. now does it?
It does work for a Mage. Character development is up to the player. Why should a Mage player be stuck on the ground just because another player refuses to play a Mage? That's a very selfish & petty outlook. By the same token, a Mage could say why should you be able to protect yourself with armor & shield if I can't levitate?
Levitation- Mage defense
Armor & Shield- Warrior defense
Final Point- Not sure why so many people don't get this, TES is a single player RPG, where each player can creatively RP their character the way they choose. There is no PvP, so there is NO SUCH THING AS AN OP CHARACTER. It's up to you to decide how you want to play.