I visit various junk yards to get parts for a few very old cars of friends and family in order to keep them legal and running. What you say sounds logical, but look at the situation in junk yards and compare it with what you see on the road.
What strikes me is seeing certain engines with holes in motor blocks, dismantled cylinder heads thrown aside after dismantling by a potential customer with valves in crater-like valve guides, younger model cars with their lower cavities or doors and floors rusted beyond recognition although the upper sections look normal, factory-unsealed cracks where two pieces of metal come together, etc. etc.. In short, all variations of modern-day junk that would not have been trashed if they were made anything like as you expect. I know why I will never consider certain brands or models. Enough said.