This seems like a huge cultural difference from the west. I personally can't imagine having lived with my parents into my 20s. The people I know who did are mostly far more dependent. I think this has a lot to do with our focus on individuality. I don't think I would have developed into the person I am today without having dealt with the hardships of making my own way in life as an independent person. I can absolutely see the financial and emotional benefits, but I would feel constantly stifled and unable to be my own person with that level of family intrusion in my life.