> Even the cheapest house built to code will be noticeably better than one from 1980s. The quality of materials, technology of materials, wiring, plumbing, flooring, insulation, etc will all be better.
This is definitely not true. Old houses have solid lumber, new ones are lightweight softwoods. Copper pipes replaced with plastic. Maybe Marble kitchens are nicer? More energy efficient is likely. Certainly 30 something families can't afford big suburban houses like their parents/grandparents.