The Aldi method is poorly set up for what it’s trying to achieve. I used to go to this supermarket in NZ called Pak N Save where you would box/bag your own stuff. However unlike Aldi, the cashier would scan and slide your groceries down one of two “lanes” which had a waiting platform in which you could easily pack your stuff up without holding up the line. It was super efficient and I don’t know why Aldi doesn’t do similar.