"As the police have transitioned from revolvers to autos, haven't their shots fired per gunfight gone up, and their hit percentage gone down? Perhaps this is the source of the idea that more ammo is bad for marksmanship."
That and a poor understanding of statistics/cause and effect relationships
Sure...more rounds are expended by the same poor shots.......
Because it is easier to shoot a lot more than 6 without reloading
But they were bad shots to begin with