I think that's more a trait of emigrant subcultures than it is a trait of those cultures as a whole. Parents who take big personal, financial, and social risks to move to another country tend to want to protect their investment. When it comes to their children's choice of career, they can get very offended if the child chooses to pursue theatre or fine arts instead of medicine or law.

If, on the other hand, you travel to Japan, Korea, or China (or indeed India, Thailand, Vietnam, or any other country in Asia where people emigrate to come to the US) and actually visit people living in the countryside, in small towns and farming villages, you'll see a radically different picture. People practicing their culture and living a traditional way of life.

The difficulty of immigration and setting down roots in a new place, far from the support of extended family social networks, serves as a natural (and artificial, due to various immigration laws) barrier which tends to select for families where the parents have this sort of drive.