I started using grocery self-checkouts during COVID, but I’ve kept using them because there’s rarely a line (and I’m a misanthrope). I’d probably go back to using regular human checkouts if I had to dig through all my crap to prove what I bought.
Having said that, I’ve noticed myself making mistakes. I’ve accidentally failed to scan an item, and I’ve accidentally entered incorrect codes for produce. When I notice, I fix them, but I’ve probably missed a few.
I guess the easiest answer is for grocery chains to reinvest some of those windfall profits and hire more cashiers.
We have reusable nylon bags and those are nice and sturdy. My local grocer… I line up my groceries on the belt in little piles and put one bag with each pile. I would think the point was obvious. They grab the bags and just throw whatever they want into each bag. raw meats mixed with boxed goods. heavy items on my eggs. I dislike going to my local grocer because there’s no self-check option. I was a cashier for a while and got a lot of compliments and praise from my customers because I bagged smartly. It’s not that hard to say “oh this is a freezer item, maybe I should put it with other freezer items”.