For a full cart, I expect a cashier or to be available.
If I have 3-5 items, I’d rather do it myself than wait.
That said, even 20-30 years ago, long before self checkout, at places like WalMart, one could wait 15-20 minutes in line. They had employees but were too cheap to have enough. They really didn’t care.
I don’t even understand how that math works. I might have kept going there if they had a few extra lowly paid cashiers around.
Not only do the prices increase, now we get pushed to their jobs for free, while the chains layoff their employees.
Hence why I usually refuse to use them if I have to take some additional extra time queuing.