Just because it's not followed, "in your experience", it's rendered moot?
My 4-some let a single through just last week, even though we were right up against another group and playing at close to a 3 hour pace. We could see that there was plenty of room ahead of the other group so we let the single blast through. The other group did the same, and even though we finished in what anyone would call a reasonable pace, I imagine that that single appreciated that he was able to play even quicker, without having to wait on every shot. Done properly, he didn't slow either of us down at all.
Let me explain in simple terms. Based on the assumption e=mc2(ghz 7) then the down velocity of the club head travelling at the speed of sound will make contact equivalent to atom theory. As yet this hasn't been totally proved, but most scientists agree it is a probability