what's wrong with coming up with ic rationale for ooc rules?
because invariably they are based on bad logic, bad knowledge of history, or bad understanding of the capabilities of human beings.
also, it's not the real reason they can't do it - it's just suggestion on how to role play it in game. It doesn't tell us if it was actually intentional that advies can't emigrate (for example), or if is just that no one ever thought to include it (and we should go make a Feature Request)
It is completely unhelpful and usually doesn't answer the question
