I have to scan an item, then wait 10 seconds for the weight sensor to register that I actually put it in the bag. If I have a cart full of shit it’s going to take me 5 minutes just to scan everything. A cashier can blow through that in a minute or two. I wouldn’t be opposed to self checkouts if they didn’t suck ass.
Just watch this whole thing. You could use it
https://youtu.be/kmYdpHtOv_E