...because the old stuff that didn't last longer has already fallen down. The stuff that's still around is definitionally the better stuff. They made cheap shit back then too. Tarpaper, clapboard, and tin huts don't have much staying power.

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Though I'd have to agree that a lot of modern construction is cheap and shoddy, possibly a higher proportion of mid-market stuff to boot. I actually worked a construction crew for a few months in 1987, doing "California framing" (one nail per side in stud blocking), and "persuading" walls straight. It was an education.