[cyberax]

I don't think this has ever been done on purpose with the explicit goal of anti-urbanism.

However, it's been done a bunch of times accidentally. One really great example: Copenhagen in Denmark. Its population actually decreased after the initial boom, it's only now back up to the levels of early 70-s: https://www.macrotrends.net/global-metrics/cities/20894/cope...

As a result, the overall Danish well-being and economics improved compared to neighboring countries. I believe, that this is very much a part of the reason for the "Danish Bumblebee" economy (meaning that it shouldn't be able to fly, but does).

And Copenhagen is routinely scored as one of the best cities on the planet.

[ofcourseyoudo]

Copenhagen's suburbanization was not accidental. They specifically built infrastructure and public transit to support suburbs with a strong connection to the city center. Their success with homelessness probably has more to do with high taxes and a lot of welfare support systems than anything else.