I think early releases of self checkouts were extremely poor and buggy. I have had minimal issues over the last handful of years, most of them would have been issues a cashier would have needed to call for help for anyway.
I also don’t feel that I’m made to do extra work. I think having someone bag groceries is a luxury anyway, and most of the time it’s done differently than I would have. I can fit all of my stuff into two bags, while a cashier will split it across 5. Many cashier’s also don’t know the difference between various produce items that requires me to tell them, when I could have just done it myself.
The only time I don’t do self checkout is if I’m getting alcohol. At some locations, I would sooner wait behind someone finishing up their self checkout instead going to an empty cashier.