The West has followed the path of freedom and free markets. The smallest unit in society is the individual, not the family (like in Asian countries). Freedom here is being celebrated, also by having the kid "finally" moving out at 18+. Those who stay are not doing it for cultural, but mostly for economical reasons.
Taking care of elderly people is not very "cool" here in Germany. My friends haven't called or visited their grandmas for many months, while my Chinese friends try to use their holidays to visit home. They are also planning longterm how to move closer together and incorporate those thoughts into the partner selection.
The Western approach is different and get often "it's me and it's my happiness".