Well, among Patrick's claims are that it's probably impossible to input all possible name even with all the power of Unicode, and that there are other limitatio

Well, among Patrick's claims are that it's probably impossible to input all possible name even with all the power of Unicode, and that there are other limitations that prevent accurate representation of names in computer system, including human errors. So my point is, maybe then it's better not to implicitly promise that your system has no limitations at all, but make these limitations more obvious instead. This'll help to avoid surprise errors and ensure consistent user experience by setting correct expectations. I admit that most users today expect systems to accept their names in their language though, and that it might be an edge case depending on particular occasion, but then I can see why most payment systems apparently still accept only latin letters (cardholder's name is an example).