AbdulAlhazred
Legend
Context changes were important, but much of what breaks the 3.5 wizard compared to the 1e M-U isn't context changes, but mechanical ones. Off the top of my head...
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There were a lot of context changes as well, particularly in what we might call the 'default' game world. But I don't believe those were the most critical changes. The details of the implementation are important. In a Vancian system, balance is determined by the implementation of the spells individually. It doesn't matter how balanced the system as a whole is, if the individual spells - the little packets of rules they represent - aren't balanced then the class that consumes them isn't balanced. Much of the balance in 3e can be brought back with some fairly minor rules adjustments and spell revisions. I await high level to truly prove that, but so far things are working out perfectly and I have one more tweak to play (bringing back casting time) if the melee/martial types start losing spotlight that I'm pretty sure will close any balance gaps that begin to develop (if they do) around 11th level or so.
Yeah, I was more meaning Vancian casting specifically as a mechanic in the context of all the other mechanics.
I think the PERSONALLY the problem with Vancian casting is that while it isn't impossibly to sort of balance it the results aren't that great. It just really isn't that good a casting system. Not only does it have to be perpetually policed because every spell could break it, but the system offers nothing but daily resources, which means either the character using it is under equipped or else they have too many spells, and it is not even possible to say which is which unless you build up a whole set of expectations of how play will be structured around the wizard. AEDU avoided all of these problems, and yet could still provide all the interesting features of Vancian casting. Anyway, I don't think any amount of tweaking will entirely fix 3e. It is infeasible to go back to the short spell lists of OD&D, and once you have 100's of spells things are bound to go sour.
Also, IMHO even in OD&D spell casting broke the game around 11th level, so I don't think you're going to fix THAT at all, not with any change you make to 3e short of a completely novel casting system. AT BEST you can maybe make it work OK up to 11th level. After that all bets are off, and I think I'm probably in the mainstream if I say that even AD&D basically stopped being playable around level 12. Things just get too wonky.