@luceos support UTF-8 isn't an issue only for Asian people, is also an issue for a lot of countries (Europe, Latin America, etc...). I said that many times arround, but once again it was fully ignored or moved to the forgotten issues.
How many times was discussed arround or at GitHub issues with slugs or usernames?
Some people requested only slugs with the numeric post_id and others requested transliteraion. With users... who knows... isn't something easy to fix.
Happy to see that after some years it caugth your attention again.