Many people don't want their online identities be easily connected to their offline identity (or even with each other). Hell, you yourself didn't register on HN with your G.I. ID's serial number for some reason, did you?
Sure, but this specific part of the discussion was about it being a bad choice because "it’s treating the identifier like a password that is problematic", which I objected to.
I do agree that in many cases I would not want to use it as my web identity. (Those cases would also overlap pretty well with cases where I don't want to use my own email address, like when signing up for sites like this, reddit, Twitter and similar).
I do agree that in many cases I would not want to use it as my web identity. (Those cases would also overlap pretty well with cases where I don't want to use my own email address, like when signing up for sites like this, reddit, Twitter and similar).