Well one thing people always love to overlook. Married couples just might not have employers with sites near each other, employers can also move, and you can change jobs.

most people just cannot pick up and move to make it easier to get there. all the solutions usually involve telling people where to live and how which is completely the opposite our society wants.

I am still waiting for a viable arcology to be built, might take a big religious group to do it but I doubt technologist ever will except off planet