I agree that "emulate the user==feed simplicity of twitter" is the best counter-argument to "make the user name distinct from the feed name for greater flexibil

I agree that "emulate the user==feed simplicity of twitter" is the best counter-argument to "make the user name distinct from the feed name for greater flexibility" position. But here: In twitter APIs, can't you get something like, say, a user's avatar image by keying off the user name? So, even on twitter, a user name maps to multiple different things -- not just a single feed.