[mschuster91]

> If restricted ASCII a-z is good enough for passport names worldwide, it's good enough for usernames.

Passports (and credit cards) are the best example why ASCII-only is horribly broken. It's 2024, people want to type in their name as they write it normally, and they have the reasonable expectation of IT "dealing with it" behind the scenes.

Unfortunately, that expectation isn't reality, and it's all too common people are being rejected at the border or their card transactions are denied because braindead policies leave no other option but to blanket deny in case of mismatches.