In ordinary English, the only relationships unquestionably covered by those words have a strong sexual and durable component, within marriage or outside it.
You'll immediately notice its difference from ordinary English.
This is the way Van talks, and Sterling sees no reason to translate his professional enthusiasms into ordinary English.
The descriptions of the sectors are not technical and use ordinary English.
In ordinary English there is a "middle" set of circumstances that "necessary" and "unnecessary" do not completely distribute between them.
Lawyers participate in this discussion, translating specialized knowledge into ordinary English, defining issues, often creating consensus.
Q. Why can't sportscasters use ordinary English when commentating?
In ordinary English, the word bias is pejorative.
But I don't see what the use of that terminology, which cuts at variance with ordinary English, adds to the discussion of the matter.
In ordinary English, to scatter is to distribute randomly.