Neighborhoods are so homogeneous in that they are strictly household only. When I lived in Japan and South Korea, even in a house neighborhood there was always a 24/7 grocery store, supermarket, restaurants within roughly 1 mile, basically walkable, always bikeable.

Additionally, similar to how house neighborhoods might have an “alleyway,” many apartment neighborhoods in Japan and South Korean have a similar “walking alleyway,” in which rows of apartments will have a huge road designated for walking behind them as well as restaurants and karaoke that typically line the road. Basically apartment blocks would nearly always be divided by a walking alleyway, which could vary in size (similar to 1-3 lanes of traffic in size).