I think we may be talking past each other here, what I mean is that federation must be strictly and absolutely invisible to users. Perhaps I was wrong to say t

I think we may be talking past each other here, what I mean is that federation must be strictly and absolutely invisible to users. Perhaps I was wrong to say that federation is in principle ruled out, but I do think that it must be invisible to users. - Including namespacing usernames to nodes within the federation as with the @ sign in email. I believe this is true in spite of the technical beauty of federated solutions, and it's exactly that beauty that's lured so many onto the rocks.