So what kinds of spells are there really? At it's most basic level, it might look like this:
- Offense,
- Defense,
- Detect.
Should there be GURPS Magic-like categories, with things like food, movement, and protection and warning spells? Default Fantasy Hero-like, vaguely related spell categories for everything from fire magic to vibration magic to rune magic? Palladium-like magic with just one bigass list o' spells and a couple specific to each class, dispensing with categories altogether? Or is everyone happy with the current spell classification system?
You might ask, "Why change things at all?" Short answer: If you say the cleric can cast spells from categories A, B, and C, and the wizard can cast spells from categories D, E, and F, and then make the spells in categories D, E, and F quantifiably better than and absolutely different from the spells in categories A, B, and C, you can actually balance cleric and wizard... maybe even druid.
Okay, probably not druid, but you know what I mean.