By that logic, a mage should be unable to cast spells naked, either. It's not that they need robes--it's that they can't cast in armor.
there is a slight difference between a requirement and an enhancment.
This is an inappropriate personality limitation. It would annoy me if I was told, "Your character MUST be an intellectual snob" without a reason. What, holding melee weapons in contempt is a requirement to make magic work? No...it's not, or it wouldn't be possible for a wizard to dual-class or be multiclassed
if you come from your academy you are somewhat proud of your work because not everyone become a magician and it is somewhat mysteries. you are more intelligent then john doe there. you are like one from the psi chor in bab5. a mage should cast spells and very rarely go melee. except battlemages who go to academies that train body and spirit.