On a more serious note, let me underscore the public-mindedness of Jimbo's approach.
As always, he is considering more than just the current contributor base, but also the
full population of potential users and contributors.
We avoid "obscene" usernames for a reason: not because Wikipedia is against
obscenity , but rather because the feelings of contributors, present and potential -- as
well as readers those of readers -- are important to the project.
Although it is a sacrifice for some of us (e.g., I'd rather be known as
"MoonIsTheSon" :-) we endure a bit of self-denial for the sake of others.
"Uncle Ed" (aka Ed Poor, which is actually my real name)