In Poland, we also had architects who designed such communities in 50's or 60's. Shops, drugstores, medical centers, playgrounds, recreation parks, sometimes much more, like kindergartens -- all just downstairs. Mini-districts, almost self-sufficient. Maybe not everywhere, but I think this mindset was in all cities. Now we have something what Poles call "pato-developer" -- extremely small apartments for high price, almost no shops so you need to sit at least an hour in a car to buy larger grocery. About 5 m^2 and 2-3 basic toys for kids to spend most of their time. And of course no recreation park, since CAR park is far more important. Today's ideas about 15 min cities are noble, but just reinvention.