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Further:

• Most self-checkouts are too small and unwieldy to hold two shoppings bags when you're packaging a week worth of purchases.
• You still need an employee to come over and certify that you're over 18 if you buy alcoholic drinks, and there's usually just one for many tills who is usually busy with somebody else.
• I like to pack my weekly shopping in specific ways (cold items together, fragile stuff on top, weight balanced) and whilst in a normal checkout I can do packaging in parallel with somebody else doing the checkout plus already place things roughly ordered on the threading band to the cashier, in the self-checkout it's just me and things are in whatever order it went into the trolley so it takes at least twice as long.
• They often have quirks, such as for example the one I used more recently would not let me start unless I put a bag in the output compartment first, so I needed to have or buy a bag even though I was buying just 1 item (mind you this might have just been trying to force people to buy a bag, since many forget to bring one - in other words, structuring the software to force people to spend money which is a form of enshittification).
• They're non standard and each store has a different model, with different physical structure and different software with a different UI with buttons in different places and often different quirks, so anything you learn beyond the basics about how to use one effectively is often non-translatable to self-checkouts in different stores.
• They often don't take cash. Cash is good, it means your buying habits are not in some database somewhere and used for things like having an AI estimate how much an airline company can wring out of you for a ticket for a flight or a Health Insurer assessing your risk profile and upping your price, it works always even during outages (of power, of your bank, of payment processors) and studies have shown people save money if they pay in cash because they tend to spend less (something about the physicality of parting ways with your notes and coins makes people be more wary of paying more than if it's just a number on a screen).

My number one reason for avoiding self checkout is that I want people to have jobs.

If fewer and fewer people use the manned cashier lines, there will be fewer manned cashier lines.

If it's busy, and I'm just grabbing a few things, sure, I'll divert to the self checkout, but if there's nobody in line, or just a few people in line, I'll avoid self checkout. I'm not going to be the reason someone lost shifts.

1. It’s often very time saving to go through checkout. It is really that much hassle to scan your own items? If you’re using a card you typically handle that yourself anyway and many places already have you bag your own goods.
2. you’re not going to get in any real trouble if you forget one item. If they happen to check and you did, simply go pay for it, or say “oops, missed that, here take it back I’ll get it next time” if it’s not needed.

Why? At least here the self checkout gets exactly the same info from me as the regular one

Mate, not the previous poster but I'm a senior software engineer with an EE degree and broad enough experience that I could design and implement myself a self-checkout from the ground up, both hardware and software, including UI and backend integration, and I still tend to avoid self-checkouts for those reasons and a lot more (many which I listed in another post here).

There are two very opposite ends of the curve for people who don't like self-checkouts: those who can't deal with the tech (who you deem "fucking morons") and those who have evaluated self-checkouts as a process and found it to overall be inferior to the existing process for their own usual use conditions or who look at it in a broader context and find it to have indirect social damage.

That you can only spot the "being a moron" as a reason to avoid self-checkouts is a pretty good indicator of your own intellectual limitations.