If a carpenter can’t read a book and understand how to make a structure without metal fasteners, they are not competent in that field. And working with raw logs is also not much of a challenge.
I’m not an especially good carpenter, and I can work with limited tools. A chainsaw and an auger drill would be really nice, especially if I had to make lumber.. but an axe , drawknife , and chisels will do.
That’s like being a programmer that can’t write software without a framework and libraries. The idea is that tools make the job easier and faster, not that you don’t even understand how to do the job, but only how to staple code together. We all start out there, and while we may rarely if ever work that way, we can when it is needed, do something no one has done for us.
Obviously, different trades have different utility if you are talking about the breakdown of society, but I’m not really leaning into that particularly hard, more leaning into the breakdown of one’s plans or expectations, the failure of a company or the evolution of an industry, those kinds of force majure events that one can reasonably expect to have happen during a life lived.
Even so, there is some comfort in knowing that your personal knowledge and value to society is robust and resistant to black swan events, I suppose.