The fundamental failure of this logic of trying to go somewhere and built a new city to escape the policy failures of the old city, is that those conflicts are intrinsic problems of large scale human organization. If you bring people, you bring the politics.
It's just the same dream that any anarchist commune has suffered from. Works okay if you're in a Kibbutz in Israel, doesn't work when you have a million people.
These startup cities always describe their policy solutions in consumer terms. 'Come here and you get yimby-ism and social services and x, y and z'. Okay what if the good people of your city turn into nimbies though? Do they have a say? If not how's anyone going to stop them, police with batons? Police you curiously enough never see on any of the concept art of all the diverse, young people sitting in front of modernist coffee shops, which is weird because I have to assume the city has some.