The weekly shop is only as good as the list you bring. Go in without one and you'll come out with three bags of stuff and still nothing to make for dinner; go in with a proper one and the whole week is sorted in a single trip. The catch is that writing a good weekly list from scratch is a faff, so most people don't — and end up back at the shop on Wednesday.
This builder does the faff for you: set your basics and it assembles a full week's grocery list — the right foods in the right amounts — so one shop covers you. Just try it and see the basket it builds. The point of a weekly list isn't neatness, it's never having to think about food-shopping mid-week again.