> You need rules for what kind of buildings can go together, but the historic mistake (intentional or not) was to zone retail away from housing and force everyb

> You need rules for what kind of buildings can go together, but the historic mistake (intentional or not) was to zone retail away from housing and force everybody to drive to get to anything that isn't a single family home. Yes, sure--I was referring mainly to American single use zoning, which is terrible. There are certainly approaches that have way less in terms of downsides, such as the Japanese style zoning.