That raises another issue which is zoning laws. I addressed that in my other comment too.

Other countries have mixed-use zoning. You can have commercial and residential buildings in the same space. You can even build apartments above restaurants.

In the US, hardly any neighborhood has any businesses within walking distance, and the ones that do usually have a sketchy walk on the side of the road with no sidewalk, and everyone who sees you thinks you're a junky because "who else would be walking there?"

And then all the businesses are packed into ugly strip malls surrounded by giant parking lots. It's not an efficient use of space.

In my linked comment, I explained how cultures built around rail systems have mixed-use zoning and less need for parking lots; allowing towns to be built more densely around stations, and contributing to walkability.

Yes, it's challenging to convert a disperse infrastructure that's been built around roads and highways into one that's as efficient and walkable as a rail-based society. I'm not denying that.

I suppose the disconnect is that you're viewing walkability and railway infrastructure as separate things, and I view them as intrinsically connected. A rail-based infrastructure is inherently more walkable; and a road-based infrastructure is inherently less walkable.