To me, it sounds like a subsystem that provides Windows Compability for the Linux host.

I do agree it's an issue of English being an imprecise language.

Still a better language than other myriad of languages with uselessly complicated grammars and rules. And I'm not a native English speaker.

And this is a poor example, because Microsoft wants to be Microsoft.

No natural language is inherently imprecise. Every language has its own system to resolve vagueness or ambiguity and elaborate on the supposedly "missing" features of the language. This issue is relatively settled in linguistics.