Modern houses are built with wood grown under semi-controlled conditions, cut to standard widths and lengths and often treated with preservative chemicals in what Exalted 2e would call atelier-manses. Hinges and other metal fittings are similarly standardized, and often shipped from halfway around the world due to marginal cost differences. Nails are often driven with hand-held pneumatic 'guns' rather than hammered in by muscle power, and that only works because the nails are a very precisely defined standard size. Workers reach high places on the outside of buildings by standing in a little basket at the end of a robotic arm, instead of needing to either build and tear down scaffolding or break out the mountaineering equipment. Paints have been developed that resist various sorts of environmental damage, but require astonishingly complex chemical industries to produce - yet another type of atelier-manse. Microwave ovens. Air conditioning. Clothes-washing machines. Flush toilets. Drywall! If you were out in the woods with nothing but a hatchet, and you wanted to make a four foot by eight foot sheet of drywall from scratch, where would you even start? C'mon, it's just gypsum dust sandwiched between paper. Simple concept, surprisingly tricky execution.
And all that's just for houses, some of the most basic amenities folks in the developed world have a hard time imagining life without. You want something like a jet aircraft, that means you need electronic controls, which means you need microprocessors, which means you need a clean room to keep everybody's dandruff off the microlithography machine - meaning, essentially, a factory-cathedral.
You do realize that you replied to a post that was made literally a year and a half ago, right?