You're assuming that all people who speak English are fungible. Someone who's spent their whole life talking to Americans in Ohio is absolutely not going to hav

You're assuming that all people who speak English are fungible. Someone who's spent their whole life talking to Americans in Ohio is absolutely not going to have experience "toning down" their English to the same degree that someone who grew up speaking with Americans and Latinos in San Diego. So sure, the Anglosphere covers half the globe, but the only relevant part of it is the part that actually interfaces with other languages.