There’s always been a lot of shit built. The good things will last 100’s of years and the shit will be ripped down in 40. The examples linked here are garden variety crap mainly. The 1970’s-1990’s in particular had a lot of bad stuff built. Especially if you want 6k sq feet and don’t understand that to build that inside and out at quality will cost a few million + land costs.

If you find a decent builder today you can have a high quality home built. But it’s not cheap. It never has been.