I like how you praise "multi-generational" Asian families at the same time as mocking "man children" who live with their parents.I didn't say it was - though living with your parents in your 30s isn't really the same thing - that's not too different to a regular household except the child/children have grown up.
Now if you have a couple + kids + grandparents... thats what is generally meant by multigenerational...
Not (elderly) couple and their (man) child
I guess you didn't want to be "racist" and thus had to dress the two things up as being utterly different. It's still one house shared between multiple generations, saving on the cost of running more than one household. Not so very different when you look at it that way. Still a massive cost saving.