Firstly, afaik many high-rises are already set up this way, especially in China or Hong Kong where they get pretty dense.

Also IIRC there's a settlement in Alaska or Canada that's just one apartment building, population of 200-something. Personally I wouldn't be able to live there, with everyone knowing who's sleeping with whom.

Secondly, I don't know how enclosed you want the space, but in many European cities, you get everything you need and most of what you want in a rather short walking distance―instead of having to drive. Plus you get sun and fresh air, as opposed to what was there in Kowloon.