20th century professional urbanism is the story of a war on complexity in order to control urbanization.
The modernists rebelled against the "mess" of the city. They put everything in their place. In this square shall be the houses. In that square the offices. In that square the stores. In some form of another, this system, called zoning, is in force over 99% of the American continent. Its main advantage is that it is incredibly lazy.
Interesting observations, and in general I agree. However, I would add that another powerful part of this film is the dystopian idea that in a "dis-aggregated" world of suburban limbo, violent death is inevitable, and often emerges out of sheer boredom.