I'm glad I live in a country where family value is strong and still living parents is less taboo, because the rent is too damn high. Although people who came from individualistic countries are judging. I remember ten years ago I have a friend from France who is weirded out we don't move out even at twenty. But even if we want to, we have a housing crisis that persists to this day?
Oh yeah definitely most would move out. Many of us who can afford to move out of our hometown and explore. Some don't return but many who do settle down, and live close to our parents' home from just down the road.
People are different, happy to hear that you have good relationship with your parents - that's not the case for everyone. Also there people who value their privacy and personal freedom more than the convenience of living in a big family.