> Each name set consists of three elements: a key that is global and securely unique (but not necessarily memorable); a nickname that is global and memorable (but not at all unique), and a petname that is securely unique and memorable (but private, not global)

An essential component of a practical addressing system is names which are global, memorable, _and_ unique. Colloquially, I need to be able to say "Google dot com" over the phone to someone, and their experience using that name needs to be identical to mine. A system that doesn't provide this property doesn't solve the problem.