That way I wouldn't need to type in my OpenID URL anymore, but could simply use my e-mail when logging in, and the OpenID would be discovered automatically.
users didn't want or were to be confused by email-like identifiers.
It's actually my e-mail address, so there is nothing to confuse.
How would this benefit people that don't have control over their own e-mail domain (e.g. gmail/yahoo/msn)?
Google and Yahoo already support it: