if entire cities were designed around these instead of cars…
The only reason you can’t live the majority of your life within that radius is because it was designed otherwise. The vast majority of human society has been within 15 mile radii, and many parts of the world still are that way.
You appear to have missed a line in the OP
The only reason you can’t live the majority of your life within that radius is because it was designed otherwise. The vast majority of human society has been within 15 mile radii, and many parts of the world still are that way.
You’re probably not going to believe this but not everybody lives in the city.
You’re probably not going to believe this but 83% of the us population lives in the city.