While I would like to change my login name, the important thing is that it's not used anywhere else. This means it does not get in the way of my self-expression, and also that nobody who I talk to through the system can harass me by repeatedly entering wrong passwords.

Come to think of it, that also serves as a counterexample to one of the article's pieces of advice: using an email address as the users login. Steam used to work that way, which is why I have to log in using a string which is an email address I don't use anymore.