The point is more than density is an optimization of the marginal cost of maintaining a person. Manufacturing all the autos, maintaining all the roads for them

The point is more than density is an optimization of the marginal cost of maintaining a person. Manufacturing all the autos, maintaining all the roads for them to travel on, and providing supply lines across vast areas of low density are immense ongoing expenses that are hugely reduced when people are centralized in urban areas. As we move towards remote work it should lead to density increases, not the other way around - living denser means more access to more recreation and services, should mean cheaper goods and infrastructure, and can stymie the isolation problem brewing with remote workers across the industrialized world.