I am conscious that many people probably read my exchanges with Don on this and think we are arguing with each other for no reason other than stubbornness.
On the contrary, I think it is not really an "argument" but an exploration of the details, and the discussion is highly useful because it is going to lead to a lot of beneficial results. If we weren't having this back and forth it would be highly tempting just to drop the subject before the implications are fully brought out.