That sounds like a pretty amazing layout. Maybe in 100 years we will have something like that in the US!
As a single person, I do not think living in a city is that big a challenge. Sure it’s expensive, you still have to hustle, but you can get a studio or roommates or even live with family, that is how people get by.
Once you are partnered and have kids it becomes much more challenging. I know someone who raised a family of five kids in a 2BR in Chicago, it can be done. But it’s a cultural issue: that is what poor people do, and nobody wants to feel poor. So we expect to have a big house that is unaffordable in the city and we move to cheaper climes and commute.
The nuclear family is a big part of the problem. Going back to multi-generational housing with little private space is not a super popular option, but Gen Z seems to be dipping their toes…