To be honest, I can see other reasons why the "staying with parents" model doesn't work well in the US, compared to the "moving out" model.
The reason is that your parents don't even stay together. Just browsing the threads, I see all the time Americans mentioning casually and incidentally that they had had a divorce, or that their parents had had a divorce. So generally it seems that divorce is very prevalent in the US.
Logistically speaking, it makes the "staying with parents" model much less viable. I mean - I could either reside with Mum, or Dad, but not both, if they are physically in different locations. Then there are other complications, like how I feel about Mum's new partner or Dad's other woman - and how they would feel about me.
Last edited by Acting Like Godot; 10-19-2011 at 12:10 AM.