What's wrong with how it's working now, for Normal?
It's been explained a number of times, directly to you. I'll try once more.
UNLIMITED LONG RESTS ALLOW FOR AN EFFECTIVELY UNLIMITED USAGE OF SPELLS.
UNLIMITED SPELL USAGE MAKES THE IDEA OF LIMITED SPELL SLOTS A USELESS MECHANIC.
THIS MAKES "NORMAL" FAR TOO EASY.
Any idea how to fix it without blocking the player's progress or making the mechanics mostly irritating (and really not limiting)? The system would also have to be understandable to the player. Practically, the only idea that could effectively limit the rest are time limits, but if larian introduced it, players would pull out forks and torches (this will not pass in such a large game). We are discussing ideas and still have not been able to find a reasonable compromise.