So Idk where you guys live and how your self checkouts look but here is my German perspective.

1. If I need a new gas cylinder I have to exchange it at the cashier's
2. If I buy alcohol or cigarettes I also have to get my ID checked. The self checkout will then be put on pause until some worker shows up and realizes I am well in my 30s. I can also not buy things like razorblades at self checkout.
3. Often the stuff will be weighted to ensure I put it in the bag and not more or less. When I buy something light, think a small back of herbs of like 15 grams, the scale doesn't realize it and again a problem occurs and a worker has to come
4. If I make a mistake like scanning twice I cannot cancel and again a worker has to come
5. It usually is a much more crammed space. I don't even need a whole trolley for it to become uncomfortable. More than 5-10 items just don't work because I have no space. Putting everything out of the trolley on the conveyor belt, getting it scanned, and then putting it back in the trolley is much easier.
6. If there are any items with a sale (30% off because BB date is approaching) I cannot scan this and again a worker needs to come.
7. I am not as fast. Not only because it is not a conveyor belt and I am not sitting at a scanner deck, but also I am just slower than a cashier who knows the code for fairtrade bananas and the avocados from spain but not from peru by heart. It's my first time scanning this can of beans, where is the bar code? While it is 9 am and the cashier has already scanned this can of beans 25 times today. (8. In some supermarkets my kid gets a free fruit which it not necessary but I find super cute. This is only a thing at the cashier's)

All I have to say is "hello", "card please", and "good day". And I can also just wave these things. So yeah, I am absolutely standing in line if it is possible. It is so much faster and more convenient and going to self checkout to then get an error code and wait for help to arrive for 10 minutes is absolutely not worth it. (Looking at you, cursed Rewe in Munich). Then I also have to explain what's the problem much more embarrassingly than any "hi thanks yeah with card please have a great day you to bye" conversation could ever be.

Edit: I just thought of an important 9.

9. I feel so much more anxious and pressured in the self checkout. How fast I am done with scanning, paying, and packing things up depends entirely on me. And I feel the stares of the people in line at self checkout stabbing my back. Telling me to hurry. I try to be fast but the more I try the more I fuck up. So for all the folks who don't like cashiers because of social interaction, don't you feel the angst of the line?

From what I’ve seen it’s a lot of incompetence ( Doing it wrong causing constant approvals) or pure laziness (I’m not gunna do your job for you!)

Very rarely nowadays it’ll be from just shit machines. I’ve seen the box ones you are talking about, no scanning, just throw it all in. It’s a great solution.