Username or EmailPassword
Well, as long as we don't know their reasoning, there is no way we can understand it. That's where a link would have come in handy.
Yes, it looks very very dumb just thinking about the security issues. But I guess the decision hasn't been made by a bureaucrat, they've probably asked some "tech pundit" for some advice. That someone should be slapped in the face as many times as the number of IE6 installs still alive. Nice retribution for the advice.