Ahnehnois
First Post
That's not a bad point.That being said, it can be difficult, at times, to make spells a limited resource. The best way I can think of to do this is to make time the main resource that PCs have, but I don't think D&D generally does a good job about enforcing this. I think time, and how to use it, deserves its own major chapter in the DMG, listing different ways of using time as a resource for different styles of campaigns.
However, I don't think limiting spell use on a daily basis was ever a particularly good idea to begin with. With monster abilities you often see better means of balancing. For example some of them (not the SoD's, usually), when you save against them, you're immune for a day. Deal with it, then move on, no spamming. I've tried to adopt this to some PC abilities. And even at-will is better; it's powerful but at least it's clear what the implications are.