Real-world non-alphanumeric usernames

These were some technical remarks about usernames and not an invitation to an open-ended policy discussion about who dictates (or believe he should really get to dictate) what has to "matter" to other people.

> It was already discovered that various MTAs and MUAs cannot deal with non-ascii in gecos, so clearly these programs no longer matter.

I think it's worth the effort to identify and fix those programs so people can use their real name for display in the way they prefer to see it regardless of what language they use. If there is no one maintaining a particular MTA or MUA or whatever that breaks because of this, then you've learned that unmaintained software eventually breaks when the world changes around it, but this kind of change could be eased into over several release cycles by making it optional while bug reports and testing are done, before accepting it as the default and a blocker.