Traditional cities were built on a human scale, ideally proportioned for face to face interaction and the manual labor involved in crafting and transporting goods and ideas. Easily defendable they fostered an organic sense of community on a scale that was intuitive to anyone living in the city or visiting it. Sustainable, ecological, humane, they enabled a civilization that gave us all that we hold dear today.
Modern cities are most often grids for the convenience of owners of utilities, rent seeking corporations and government agencies. Their only reason for being is to provide a convenient place for you to sleep while you earn the money you need to partake in the consumer culture that is allowed to you. Absolutely unsustainable the city relies on strip mining and environmental destruction of both nature and human culture in far off countries while simultaneously making you utterly dependent on it.