I agree with el_kalkylus. If you're not worried about how soon your hybrid fighters can effectively cast spells, then making them a pure caster for a level wouldn't be something you'd care about.
OTOH, I like to utilize the spellcasting abilities of my hybrids, and switching them to a pure caster for one level allows me to up their skills, so that when they do begin casting spells, they're more effective (more spell points).
And for one level, you haven't lost anything in attribute points (you're still distributing the same number), and only a little in combat skill points. The only catch is giving them enough points in int or pie to allow you to change classes in the first place. I tend to choose races that aren't too shabby in this department anyway, so it's not like I'm giving up tons of attribute points to make it happen.
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