Nobody, at least nobody who is thinking straight, would claim that someone who can speak English, particularly one who can do so fluently, doesn't have immense knowledge and skill in that area. It may not be an economically valuable skill due to the ubiquity relative to the need, but that, again, is something else entirely.
There's also a big difference between being able to just speak English, and being employable in a job that focuses on use of English as a skill... like writing a TV show or a book
I’d wager that someone who learns English as a second language has a better technical understanding of the language than the average native speaker, even if they don’t sound as natural speaking it.
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