At a suburban population density of 640/mi^2 (1 acre/person), a circle with 3 mile radius covers 18000 people. A 2 mile radius covers 8000. A 1.5 mile radius covers 4500. A 1 mile radius, only 2000. A 0.5 mile radius has 500 people in it.
Realistically, a person walking at 3 mi/h won't walk more than 0.5 miles to visit the local shop, and a person bicycling at 12 mi/h won't go more than 3. They won't, unless they are combining trips. If the shop is on the way to somewhere else, or a very short distance beyond their primary destination, they might go further overall.
But pedestrian and bicyclist infrastructure is practically nonexistent anywhere in the US except for a bare handful of cities and suburbs. Many places don't even have sidewalks. Nearly everyone uses an automobile for personal transport.
As such, the "local shop" is right there at the gas station. We call them "convenience stores". They are most often placed at the intersection of arterial roads. So if you are lost in the back streets of suburbia, you will never see one.
It doesn't make sense from a planning perspective, but it does from a money perspective. When a developer subdivides a large property, they reserve commercial lots next to the arterial road, and build access roads past those into the residential lots. In theory, once the houses are 80% built, all that residential traffic will be flowing past the commercial lots at least twice per day, and a business will build there.
In practice, the developer exits after 95% of the houses are built, dumps the remaining 5% and the commercial lots on a strawman company, moving on to the next subdivision, and those businesses never actually get constructed.
So you end up with huge areas of houses and very few businesses. There might be one strip mall every 3 miles, filled with businesses that usually last a few months before failing from lack of customers. (The exception is the pizza delivery, which will be absolutely thriving.)
Residential buildings simply have a higher profit margin. Think about that before you decide to trust the developer's "phase IV" plans, when you're buying in "phase I".