My experience validates the saying that “The only thing more dangerous than a single pilot, is two pilots flying together who haven’t been trained to do so.” I’ve got 8,000 single pilot, GA hours. I don’t know how to fly with a second pilot. On the rare occasions I have one aboard I tell them I only know how to fly single pilot and while they are welcome to comment on the flight and my flying, I’m not going to assign them any duties (and please don’t touch anything unless I ask). I tried that once and it just disrupts my flow, making the flying more difficult. That applies even to a second pilot handling the radios. I know how to fly by myself and not in a two man crew. If there was another pilot I flew with regularly I’d consider training and practicing to become part of a two man crew, but that’s never been the case for me.
This is a companion discussion topic for the original entry at https://www.avweb.com/features/reader-mail/top-letters-and-comments-september-15-2023