#9 in particular. One would think that after a week or two of dealing with all the problems related to a username (having to be unique across all users, having to have a forgot username form, etc.), one would realize the value in a naturally unique and easy to understand value like an email address. But in spite of this, the use of usernames abound.
I don't want to be forced to give an email to every website out there. Give me the option of making my login name whatever I want it. See, for example, HN.
I don't see the HN example. It has my email address. The only sites/apps/services that would apply here are those that could get by with zero ability to communicate with you outside the site. For instance, if they don't have either your phone or your email, how would you reset your password? How would your identity be verified, assuming other parts of your identity mattered. There may be a use case for what you're saying, but it seems like an extreme corner case.
