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.
A couple of my aunts were cashiers around the same timeframe, one of em a single mom. I don’t know how much they were paid, but they had decent apartments in Toronto around Roncesvalles with enough square footage for a kid and his cousins to get “up to speed” (I mostly recall the injuries)
That lines up with my memories in Saskatoon. Injuries aside :) By then I had my own son to manage!