Certain concepts are more difficult or less difficult to express depending on the language. I think somewhat differently in Korean than English. Translating existing text can be very difficult and nuanced because of how concepts can be expressed differently.

This also ignores the issue that the majority of the world would have to abandon their language, no matter what language is picked. And how do you pick a language? It’s entirely arbitrary. You can argue for Chinese just as well as you can for English.