Comment by bialpio

It helps with availability of materials if people don't expect to have like 500sqft per person. But that's not how modern houses are built in US, at least not in my neck of the woods (Seattle suburbs). As for the quality of housing, I'm from ex-Soviet satellite state and lived in a prefab apartment block - yeah, it was a bit dated but no major problems with quality that I could tell. The main nuisance was lack of acoustic insulation.