Basically what you loose when you change a magic user to another class it the ability to learn new higher level spells. I think they are limited to only learning spells up to half their spell class proficiency. Best advice before changing magic users is to at least get them up to level 14 and learn all the higher level spells you want them to know before changing class. They will still be able to cast all the spells they know.
Wyv
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