Isn't that called romanization? Similar to turning 刘慈欣 into Liu Cixin because you can't make the characters
I've found that germans take it for granted that it works this way, but I know of no other latin-script-based language that does romanization. Granted, I don't speak very many languages, but at least among the bigger ones like French, it's not like you write cafee (add an e because you dropped an accent), it's just cafe when you can't make the é. That's actually a terrible example, I just realized, because in german you totally use kaffee (yes yes, different word but same root). Let me try again with the word naive, coming from french naïve: you'd never write naieve. Or if you don't know how to make the ï in Dutch geïntegreerd, writing geintegreerd is understood by everyone whereas geientegreerd only leads to confusion. You could argue that it's because these ï don't have an "e" quality to them, but there is no other romanization taking place either for these, it's just dropped. Only Germans romanize to preserve the pronunciation-to-spelling mapping