I think the problem was that when you “quoted me” saying the opposite of what I was saying that I took it as if you were rebutting what I was saying (just look up and you will see by your response of “they can and do”, not “supplementing my response”, so it wasn’t that your point was being missed on my end.
Like I said earlier, “like you said” at controlled airports, I know exactly what you were talking about, and never contradicted what you say about controlled airports as I was continuously referring to uncontrolled in all my posts.
Heck, at controlled airports, personally never thought or even cared when ATC cancelled my IFR, I just was happy to make it through all the frequency changes compared to uncontrolled airports. 
The miscommunication as I see it was we were not clear on the type of airports which as we all can see does change the answer 180 degrees (cancel vs not needing to cancel)… 
Allen