Another anecdotal reason not to use hot garbage like small of back holsters.
Not that I would EVER be in favor of forcing it through gov, but sometimes I wish an 8 hour defensive pistol training class, including shooting from the holster, would go with one's first pistol purchase. That would talk most people with a >100 IQ out of a small of back for any kind of constant carry.
I say constant, because though not small of back, I have in the past answered the front door with a .45 in my jeans rear pocket. Besides lack of quick access though, I can't help but think how much it would hurt falling down with a full size in a SOB holster.