People blame vance for spell slots (though it was more like power points) but isn't it fair to say that spell slots are indirectly responsible for the existence of full casting and it's arbitrary powerlevel across so many mediums?
If anything, he's the unsung hero of wizardkind, an infiltrator who spread a mindpoison amongst the proles that 'how often you can do it' was a counterbalance to 'what you can do'.