So they are offloading checkout onto the consumer via dash carts. There's no value proposition for the consumer unless somehow they are able to lower prices by not hiring cashiers.
That's the only place where it has a step I don't need, it wants payment because capitalism, so there's a bunch of touch, tap, touch again sequences to get from it knowing what I took to being satisfied that I have exchanged money for goods and then I can go.
One thing I barely noticed at all until after it had happened was the removal of cashier operated checking out from most of the store. Ten years ago there were maybe 20 such checkouts, then sixteen after they added some self-checkout features - obviously rarely all manned but they existed. Today it's four, and often none of them are open, because almost nobody stands in a line to have somebody else scan your shopping, why would you?
Instead there are three distinct self-checkout zones. First, the one I use almost always, for people who have scanned their purchases already. There's nowhere to put anything, because these are just vertical terminals for taking payment. Then, short order terminals, a small built-in scale is provided so that you can buy say, lunch, but there's nowhere to load and unload a whole trolley of groceries. Finally the big shop terminals with lots of dedicated space for you to transfer from a trolley onto a scanner and weigh scales, then to your bags, this takes up most of the space previously occupied by cashiers.
If you've scanned everything you can actually use any of these areas, because the terminal understands that you've already done the whole job, but unless it's super-busy it will be easier to use the dedicated area for people who've done all the scanning.