Children don’t really want to live with their parents. I live in Thailand, many people here are poor and live with their families for a much longer time. Well, that leads to things that if you’re dating a girl, she’ll try to move in with you in like 1 month of dating to escape her family (I personally wouldn’t move in with someone until like a year at least). In these families, the kids are used as “retirement” and have to send money to their parents every month (I know a few girls that make like 15000 baht a month and give 50% of that to their parents that do nothing). The “more communal” living they have in non-wesern countries doesn’t come from a good quality of life. I’d say the fact that in the west children move out quickly is a sign of a much much better quality of life in the country on average.