I liked them as well, those self checkouts. Use the app from the store, scan what you need, have a total at hand, checkout and leave. That was how it went at the start.
Now it’s:
start app
battle with the wifi, as the store requires you yo use their wifi to be able to scan, let alone check out
have a grocery check at checkout (and need to pack it again, as no, they just take out, not repack)
when buying alcohol, have an age check
when buying a crate of beer, wait for the help to get a sticker
checkout
get a receipt even though you’re happy to go paperless and set so in the app
get stopped before leaving, as the sticker needs to be put on the crate
leave the self checkout area
get checked if the crate of beer you have has the sticker (even with 1 item in the cart, the crate and the bloody sticker clearly visible)
leave
When you’re just going for the crate of beer, you’re at least 5x as long busy by jumping trough all hoops at self scan and get treated as shoplifter to boot as well. I’m done with self scan. (especially with the shop closest to home, they lost a customer)