America promotes rugged individualism and strongly encourages children to move out as soon as possible.
I could see the benefit of multi-generational families, especially as parents age and need extra assistance. I just don't like to automatically assume that only one way is right. There are likely pros and cons to living at home and moving out on one's own.
Often, you will read about the multi-billionaire getbiggers who walked 86 miles to school with no shoes on, moved out at 13 years old, and owned 8 businesses by the time they were 18 years old. 
I have an aunt and uncle that are just the coolest people in the world to be around, and both of my cousins (male and female) stayed there until they got married at 25-28. My male cousin wanted to move out earlier, but my uncle told him "don't be stupid. you work full-time, and are hardly ever hear. when you are, we hang out and take you and your sister out to dinner most nights of the week. save your money til you can afford a house" So he did, and when he moved out he had enough for the whole thing. My female cousin did the same. She was a dental assistant so didn't make as much, but her husband lived with his parents too and he had a great job right out of college. They put down 75%, and there house will be paid in probably the next 5-7 years.
If you have a great family relationship, I see nothing wrong with it. Wasn't an option for me. I was gone within a year of HS graduation.