You're saying this like it was some deliberately hostile, colonial move to impose ASCII on the world. But I don't think it was quite like that, more that in the beginnings of computing people designed and built things for themselves. And it just happened to be that a lot of that early work happened in the anglosphere.
I honestly think it has more to do with culture. I've never been to the US so this might be completely wrong, but my observations from talking to people and just observing:
- if you move to the US and have a name made up of non-ASCII chars you are more likely to either drop them/substitute them with ascii chars, or use the Anglicized version of your name if it exists, or adopt an English name. And then it's kinda easy to legally change or your name. Or screw it, it's kinda easy to just show up and tell them you're Johnny Awesome and then you're Johnny Awesome.
- if you move to Germany, you can't legally change your name at all without good reason, every document ever, no matter how informal (especially at school) will probably have your full name, maybe hopefully just "First Last" and not all 7 of them, everyone of authority will refuse to call you Johnny Awesome if your name is actually Johnathan Jean-Pierre Awesome-Livingston, and so on, oh and they will also fail to not butcher your name if it's not so easy a 4y old can learn it.
We can't be the only ones leaning more towards #2. And no, I'm not making this up, my go-to example is that I've seen cases where things like officially not calling "Bill Gates" "William Gates" have met resistance. Your name is your name, and I'm still not sure how people in the spotlight are able to be called Dick, I'm not joking.
Try living in an asian country - probably you will have to choose a name in the local script which at best vaguely sounds like your given name. It's expected that if you use someone elses playground that you adapt to their rules - that goes for moving to a foreign country and to using technology primarily developed in one.
