You're right. The most environmentally-friendly solution is to truck, train, or ship things into stores in big cities and let people walk or take public transit

You're right. The most environmentally-friendly solution is to truck, train, or ship things into stores in big cities and let people walk or take public transit to get their things. I'm not sure how you imagine that ordering direct from a manufacturer works, but I'm certain that most of them have their goods in big warehouses and use major delivery services to get those goods to you, much like they would get those goods to an ordinary store. Goods are going to be shipped, flown, and trucked around. Until we invent macro-scale teleportation, there's no reasonable way to stop doing that entirely.