What is the point?

1- You have only 3 bars which are maxed easily by just having all spells from two schools.

2- You are talking about ignoring every single other thing the game offer for combat just so you know all spells, once more what is the point?

I still don't see the point, you are locking all schools into one character that can't possibly have enough AP to play around with all spells from four schools.