A large number of them being filled and another large number of them YET not being filled still makes dozens of millions of cities coming to being out of nowher

A large number of them being filled and another large number of them YET not being filled still makes dozens of millions of cities coming to being out of nowhere and providing people with affordable, well-planned urban environments instead of using the demand to skyrocket the real estate prices at the cost of causing homelessness and suffering. That's responsible, future-oriented development.