Pretty much the title. Like, get those handheld scanners and attach them to the carts. I scan items as I put them in, roll up to a “register” where the cart is weighed and verified by a cashier. I just hand over the cash then leave. Or even better, install load sensors in the cart.
Usually I like to pack my groceries into my boxes as I get them into the cart. Keeps things orderly and neat and I also don’t buy more than I can carry home. But this means I have to unpack them to place on the belt then pack them all over again after paying. It would be kinda nice to just pay by the cart load.
In Switzerland big super markets have this with handscanners. You can also use the Supermarkt App and scan the stuff with your smartphone. When you leave you just checkout and payment is processed automatically if you have set it up or you can pay at a terminal. Sometimes they do random checks.
Same in Belgium, no scale involved, just a handled scanner you bring in the shop. At checkout you give (or put back depending on the supermarket) the scanner, then an algorithm tell you if you’re elected to a partial control (in which case a cashier scan some of the articles, again there are some rules depending on the brand of supermarket - some ask rescan 5 random products, some 10, some explicitly list most valuable items, some require the cashier to count items,…). I say an algorithm because experience show it’s not just random (for example in the supermarket brand I most often go, if you cancel an item on the scanner, you’re 100% sure to have a control).