yeah, on second thought, you're right regarding Asia.... to a degree. I worked in Singapore for a while and a lot of people my age didn't live at home, and a few did. Singapore was a bit different though, it's bloody expensive there.
In the Philippines I found that depending where you were from, depended on whether you left home as early as possible for better opportunities.
Never heard of the dorms thing though.
My wife and I will buy a house one day, but it won't be near any of the "big" NZ cities. Too expensive.
I see the logic too, but surely your mental health must suffer!