But can't sustain itself. The larger it is, the larger the diffuse buffer it needs to support itself, and this diffuse buffer naturally spreads out as well. It's the natural flow of things to do so.
It’s far more sustainable than the suburbs
No need for a lot of transportation as we have good communication.
What about physical goods?
Localize production where possible. Forget about scaling at all costs, because some costs aren't worth it.