You wait in line because there weren't enough checkout points in the first place. Poor customer service by your supermarket. It is funny, in the supermarket near me people are coralled into a kind of scan barracks where underage teen guardians frisk their shoppings regularly. There is only one checkout with personnel still operating it. What regularly happens now is that there's a big crowd waiting for a free scan point, like cattle, while that one patient cashier is waiting idle. And will process the groceries much faster than any self-scanner can. Brave new world.