I don’t know much about these Chinese prebuilt houses. I’m not advocating for them. But I’m not sure that the house you are describing which sounds pretty luxurious relative to modern American standards and especially historical standards needs to be what “affordable housing” is, and unless, then it is a scam of unaffordable shack. By all means have your own tastes and preferences and get the house that you love. In the 1950s as an example, typical sized families did not have more than 1 bathroom, did not have a two car garage, game room, or a library room. The TV was in the general living space that replaced the radio. Lots were probably larger than typical lots today. People spent less time in their houses, and they spent more time in community interactions. But the built environment was less. I challenge if a lot of what comes expected now days is really necessary.
Discussion
You may be right. It probably is a little more luxurious than modern American standards.
I just described a typical Utah middle class home.
We do have larger homes than the average American home, probably more out of necessity because we have larger families. The Utah new build home was about 2400 sq. ft. bigger than the average American home, but they have been shrinking lately.
You can get a used RV in decent shape for a couple grand (in USD, so expect that number to go up). Why buy this strange thing? Made to look like luxury but really it's plastic and waiting to fall apart, just like everything brand new.
If you buy used or do it yourself, you get things at the cost of their marginal utility. You keep capital flowing between people around you.