I suspect that the OP is not describing language proficiency. I have met many American-born (and speaking) developers who are still terrible at communicating.

I suspect that the OP is not describing language proficiency. I have met many American-born (and speaking) developers who are still terrible at communicating. Not that developers are alone in this of course, but it's a profession that allows people to work alone (and often at home/in isolated environments) a lot more than other jobs do.