YJCE identified a lack of usable concepts as the root problem. Human-memorable 'handles' actually make things worse in that they add in another concept that the user has to learn about and understand. The idea that the ridiculously large number represents a human identity is very easy to comprehend and the user can not avoid contact with that number in a system like this. The number is the identity.

Usability and convenience are two different things. A system that is difficult to use might be easily understood by the user and vice versa.