Likewise the hex of a 128bit key is unbreakable but will fail almost every password policy becuse of repeated characters and lack of upper case/special characte

Likewise the hex of a 128bit key is unbreakable but will fail almost every password policy becuse of repeated characters and lack of upper case/special characters. Though for accentuated characters, I can think of some scenarios where it is not a good idea. Say your users may have to travel / use some terminals. If the keyboard doesn't have those characters, you locked them out of the system. That's why I think non ascii characters aren't a good idea. Also you make yourself more exposed to developers doing something silly like mixing string encoding between different interfaces.