Quality lumber is
incredibly expensive now compared with 1914. I owned a 1910s-construction house for a while, and they used huge, thick wooden boards around the foundation where the structure met the stone-and-mortar basement walls, and in the
floor joists (visible in the basement), and in the diagonally-run underfloor boards (used where we'd use plywood, today). Nearly knot-free, perfectly straight, that stuff would probably be put aside for high-end fine woodworking or even veneer-making, now. It was
beautiful stuff and they stuck it under the floors. The ones around the walls must have been something like 8"x14" or bigger, and tens of feet long. Nearly-flawless pieces of lumber. I assume the wood used in the wall framing (some pieces likely three stories long—it was a balloon-construction house) was similarly astoundingly-good by modern standards.
That stuff was, evidently, so cheap from the perspective of people in the 1910s, that they didn't think it worth any amount of effort to sub in worse wood for places where looks didn't matter. These days, some of that would be hard to find at any price, short of salvaging it from old buildings like that. And that's the "crap" they put under the nice wood they used for finishing!
OTOH we do have drywall, which has got to be cheaper in pretty much every way than lathe-and-plaster.