At a festival couple of years ago. Band starts song intro. Singer goes talks to one band member. Crosses stage and talks to another. Comes back to the microphone and owns up that none of them can remember first line of self-penned song. Half the audience launches into song. All have a laugh then carry on. All folk together.

As I said. I think some people's rules and customs, as presented, ignore how real people's brains work.