In some places, the problem is that scammy builders are not building homes to spec.

I'm talking about very serious flaws: not like drywall being thin, but more like joists that are thinner than the engineer specified or incomplete flashing that lets water leak into the insulation whenever it rains.

A few years ago, I worked in a brand new building, and we had issues like windows being installed inside out, pipes not being connected together, and rainwater trickling down walls under the paint.

These builds are poorly engineered -- not by the engineers and architects, but by the builders ignoring the engineers and architects. You can see numerous egregious examples here, for example: https://m.youtube.com/@Siteinspections