Quite. The key point is that you can make as many pseudonyms as you want, but you have only one real name. If there were some way of checking that this 'Nightstrike' is also called by the same name in other contexts, such as his or her day job, and of guaranteeing that the same person cannot invent new ones, then it wouldn't matter what the name is.
From a computer-security point of view, as Nightstrike points out, it makes no sense to ask for a real name without doing any verification on it. But from a social point of view, encouraging the use of real names rather than anonymous or psedonymous handles can create a better atmosphere for collaboration. The online encylopaedia Citizendium, for example, has a policy that everyone contribute under their real name. It is held that this will tend to get better contributions and more mature discussions.