Counter Counter Counter Argument: spellbooks are important and it has, in fact, been demonstrated that spontanious casting of new spells is not normal and that you need to check the books to know what you can do.
We have evidence that spells can be modified in major ways or develop new features(Nanase's fairy getting the abiility to scry on her body of launch fairy punches.)
If nothing else, If Elliot hasn't been checking to see if Cheerleadra has new powers or something, especially since he's been chastised for not checking his book before...
Now it's time for a Pol: Who here would regularly check their spell book if they awakened?