@libroraptor @anne_twain @Gustodon @georgepenney where I live we've never had packers at the supermarkets: you were always supposed to take stuff out of your cart and put them where staff would scan them and move them to another area where you could pick it back up and put into your bags.
in this context, self-checkout with a scanner that you carry through the store is pretty convenient, since it gives plenty of time to pack things without being in a hurry (and then you can pay at a human-staffed checkout, and have the best of both worlds.
Self-checkout at the shop exit with a queue and everything is the worst.
(Maybe it's because I'm not used to them, but the idea of having somebody else pack my groceries sounds really strange: they may be good at packing things in a safe way, but they can't know that I want stuff divided into different bags depending on where in the house they go, and stuff like that)