I'm surprised so many people are focused on the Economizer, since Osmose makes it almost completely pointless. By the time you can get an Economizer, there is basically no point in the game where you can't recover missing MP from enemies using Osmose. I'm amazed so many people even bother to use it when you could replace it with a relic that would actually do something useful. Then again, if you nerfed Osmose then the Economizer would become a lot more useful.
Seriously, Osmose is completely broken.
I think making it impossible for most characters to use magic at all is a bit extreme, but maybe the females and Stragos should be the only ones able to learn all spells.