English is really diverse and used differently in different circumstances by different people. No one document can capture all its varied uses. Maybe I come from a place where “foo” is used one way and you come from somewhere it’s used differently or not at all.
No sense arguing about it or trying to forcibly impose one setting’s linguistic conventions on another: “this particular usage is universally [un]acceptable!” is hard to justify and can be inflammatory. “In my field/neighborhood/cohort/office/family we use ‘foo’ this way, not this way” is information that can improve communication and hence is more useful.