Doesn't the GECOS field already cover some of this use case?

And it's not as though a non-Latin-alphabet username would really help that much, since so much text - especially in path names and URLs - is in English. There is, however, the full name of each user, and I'm guessing that should be much easier to have non-Latin UTF-8 in. And for non-computer-literate users who need a lot of hand-holding, they might actually see mostly/only their full names.