> * “English” refers to a single language.
>
> * “US English” is good enough for all English speakers.
>
> * US English is well defined and refers to a single language.
There are certainly pretty extreme differences in spoken language, especially in the UK with its vast collection of local dialects, or in places where English is on a continuum with a creole language (Jamaica, Liberia, etc.)
But I would have thought that any regional variety of written English could be readily easily understood by most functionally literate speakers. I can browse English-language newspapers from the US, UK, Jamaica, India, and the Philippines and understand everything or nearly so. Is my assumption incorrect?
Anyway, I'd add another falsehood to your list:
* People prefer to consume content in their native language.
I think most bilingual people would prefer to read original content in their non-dominant language than a (poorly) translated version in their native language.