I've worked most construction trades and built three houses that my wife and I designed. The devil is in the details. Some machine layering out concrete like a

I've worked most construction trades and built three houses that my wife and I designed. The devil is in the details. Some machine layering out concrete like a 3D printer is something I saw in Popular Science decades ago. I always wanted to see it happen. Even with a giant 3D printer, you'd have to have people there to lay conduits for plumbing, electrical, etc. The devil is in the details and most of those details are hidden from view. Out of sight, out of mind for most people. Once you do these jobs you realize there is so much that goes into a house. Once a house is built in a way that is "out of the norm", you'll raise a few eyebrows from inspectors too. We had that issue and it was because it was a timber framed house like someone might have made 100+ years ago - no bolts, nails screws, metal brackets, etc. It was 100% put together with joints and pegs. The inspector only walked around with his jaw on the floor. We finally sat him down to show that we did our homework and followed engineering guidelines - but they weren't guidelines that he was familiar with.