Here's a great case in point. I wouldn't consider myself an authority on all things English, but I do have a degree in English Lit with a minor in philosophy, and spend much of my days communicating in writing as a core function of my job. I'm literate and have a pretty good command of the English language.
I've also spent the better part of 20 years working with people of all nationalities and varying degrees of facility with the language, often working through interpreters, relay services or even written notes back and forth in some cases. Add to this that many of these people are disabled in some way, either physically or mentally. So, I have a lot of experience communicating in English under difficult conditions with people who have little to no capacity for the language.
So, the English language is kind of in my wheelhouse. And I disagree with you. Presuming, based upon your remark about people who have studied Engilsh, you are also at least something of an expert on the language, this is a perfect example of where two "experts" can disagree fundamentally.