Is the list of weapons that can be used by each class absolute or is it purely a list of weapon types that a particular class can be proficient in?
Realistically if a magic user picks up a sword and swings it, it's going to do damage to someone if it hits them, so it makes no sense that they simply can't use the weapon, it's surely just a question of competence?
In the case of Clerics and Monks the restrictions could come with sanctions from their order (and potentially their god) if not followed (possible exception of extreme emergencies) but for other classes would there be any real sanction other than being rubbish with it?
How do (or would) people play this?