yes, primarily, including regulation of materials / methods

I would dispute that. Modern framing and construction is not that difference than 100 years ago, and in many cases is even easier. Oh sure we don't make balloon frame houses now because they are a fire hazard, but the skills used to put a floor in before the second story wall is no different than putting up a 2 story wall and building the second floor onto that, might use a nail gun instead of a hammer because it is 10x faster for sheathing though. And things like plumbing and electrical and drywall and flooring are easier than ever. I don't gotta plaster an entire wall into existence, just the joints between drywall. I don't gotta put ceramic knobs up to wrap my wiring around, I can just pull a shielded wire through the walls. I don't have to cut and solder lead pipe or install ceramic drain lines or huge threaded cast iron pipes, I use plastic which is way faster and easier in every way. I don't have to mend carpets, you buy new, and laminate flooring is cheaper than anything ever before and is so easy ive had a 6 year old child doing it. Tile hasn't changed in like forever.

If you follow the bog standard construction methods, there are only a handful of dangerous or bad things you can do. Like pulling wire through sharp metal conduit holes and not using grommets. Or sticking your furnace up tight against bare wood boards or paneling. Or being completely clueless and ignoring the instructions printed on your insulation and creating a plastic trap for moisture to accumulate. Using brittle screws instead of nails for framing. And almost all of these things would be caught by an inspector immediately if you even tried.