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I think this is part of it. Anecdotally, I have heard from a few chefs that young people today know a lot less about how to cook than they used to, so it's harder to hire line cooks. The same goes for many other kinds of basic things, like repairing your house, sewing clothes, etc.

At the same time, a lot of these basics are getting more difficult in the name of efficiency: think about repairing a linen shirt with a loose weave and no stretch vs repairing a spandex-poly shirt with a very tight weave and a ton of stretch.