> I have more land, I can see trees / stars.
This could be a good amenity for you, but not for everyone. Me, I don't really like the idea of having to maintain all that land as well as having to drive everywhere because everything is so far apart.
An amenity I need that I definitely would not be able to get in a small town would be access to a Chinese grocer. As someone who is ethnic Chinese, I have recipes that need ingredients that either aren't normally found in regular US markets or are available in poor quality and at higher prices. Delivery of niche goods is astronomically expensive. That limits me to a few major cities.
> Then Sacramento, San Diego, Colorado, Texas, etc. is where people would move. This would help wealth inequality (spreading the wealth) and improve mental / societal health.
The first part is happening, the second part isn't. If anything, some of them are starting to see San Francisco type problems, and it didn't take very long for them to get there because there are so many Californians that it takes a small percentage of CA's population to go and massively disrupt a smaller city.