More like zoning laws, I was shocked at the density drop between "residential/office tower" to "single family houses" in most of the US cities. Local governments are also super worried about mixed use for some reason, they really don't want a corner store so people won't drive in the hood.

Even in walkable cities, the local government are idiots, see the San Francisco zoning map, all the good stuff exists for historical reasons, not because of masterful planning: https://sfplanning.org/sites/default/files/resources/2019-02...