If houses were designed like car-oriented cities

I found this satirical floor plan on the 21st Century City Twitter feed—illustrating the absurdity of automobile-oriented community design. Just like the heart of many cities and towns built since 1950, there is more space for vehicles than people. Moreover, everything is accessed from the automobile space. You can't enter the house, bed down for the night, or relieve yourself without passing through the garage. That's a perfect analogy to the conventional suburb where someone steps outside of any building and finds a public realm built primarily for vehicle travel. You have to get in your car to get anywhere. The question that this illustration poses: If we wouldn't live in a house like this, why do we build cities and towns this way?