I live in a metropolitan area and can walk to many stores within a 30 minute radius. (First supermarket is less than 5 minutes away).
But there is the added complication of weight. I can’t buy food for a week without driving there. Nor can I go and buy a TV by just walking to the hardware store.
It's an infrastructure thing. With the right regular/cargo bike or even better, an ebike/cargo ebike, 30-40kg of groceries per run is super doable.
> Nor can I go and buy a TV by just walking to the hardware store.
Do you buy a TV more than once every 5-10 years? You can rent a small van or whatever.
30 minutes is on the longer side, but I think part of the point of walkable grocery runs is that you don't buy a week's worth of food like you do in a car. When I lived in Paris, I'd happily pop out to buy whatever I needed for a single meal. I had so many grocery stores within a 5-minute walk. Now that I'm in SF, I buy for the week (on my bike with panier bags) because the grocery stores I like are far from my home.