Quickleaf
Legend
Not necessarily the whole sorcerer kit. Just the "Pick X spells, and that's all you can do" bit.
Gotcha. Yes, in the hands of a responsible somewhat experienced player that could totally work.
My proposal was meant to enforce a theme (and minimize cherry-picking) while fulfilling the OP's mandate of having all spells available to the class (at least at character creation). I was trying to present a design that didn't assume the player was (a) experienced, and (b) not a power-gamer.
IME the players who are most apt to request "a wizard like (insert literature source)" are less likely to have much experience with D&D, whereas the ones most apt to request "a mystic theurge who can cherry-pick whatever spells I want" are more likely to be power gamers. Of course, that's just anecdotal, so take it with a grain of sea salt.