Tony Vargas
Legend
The slots require rest and are weirdly discrete ( you can find yourself, for instance with the ability to cast a 1st or a 9th level slot, but nothing inbetween ). Prep OTOH, is now a matter of swapping out what amount to known spells for other classes.. But whatever sort of brain-bendingly complex magic the wizard rules are modeling, I would say that three things are true of it: (1) it treats spells as discrete units that (2) are limited primarily by the need to rest and (3) require preparation.
But,, in neither case are they necessarily qualities of the fiction being modeled rather than artifacts of the mechanics - because we're not really given a clear or thorough understanding of that fiction. So, we're free to fit whatever fiction appeals to those mechanics, to whatever degree we may be comfortable with.
For the relatively close coupling of mechanics & fiction you're talking about, spell points would be more appropriate, and similar variants have been common back to the early days of the classic game, in spite of their balance problems, for that very reason.
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