Originally Posted by
Basil
I have no incontestable solution to this difficulty but I do not believe that having CC or 'Sky Marshall' on the flight deck when one pilot leaves is enhancing safety.
You are replacing one potential problem with another.
This reminds me of my mother, who refused to wear a seatbelt while driving, pointing out that in some circumstances (she cited going off a bridge into a river, as I recall) the seatbelt could trap her in the car. As some might put it, wearing a seatbelt is "replacing one potential problem with another."
I always wear my seatbelt, for the same reason I want the "two in the cockpit" rule. It's the safer alternative.