You are right, this is of course argumented from an ideal perspective. Building and managing cities like they are now, just denser, wouldn’t work.
In an utopian world that really put the environment first there would be no greedy investors and greedy landlords, no one would feel left behind and instead of using farms we’d have some kind of ultra efficient vertical hydroponics stuff going on.
It would be amazing having sci-fi mega cities, perhaps connected via underground railroads and between them just nature undisturbed. It feels like we are so close from a technological standpoint to make that happen. At least it’s not completely unimaginable.