the scientist or engineer who needs something machined in an arbitrary shape to within a certain tolerance now has access to someone who can do it.
That's a distinctly different skill, and covered largely by "Woodworking Turning Patternmaking and More" or any of the works called "Pattern-Making" (which darned well should be part of a survival library). And you'll find that the results tend to be the exact opposite of "pretty" (sanding wood perfectly smooth tends to be incompatible with precise tolerances, and in practice patterns used a lot of (flat black) paint and wood filler).
Gothic (or any other type of architectural molding) is the exact opposite of precise. It's intended to be banged out in quantity, often by multiple craftsman, and inaccuracies are largely masked by repetition and the sheer scale of the works, and the specific patterns and styles are driven largely by fashion and trends of the period. In other words, most of those kinds of "books" are more like catalogs than instruction manuals.
I'm not saying there might not be any value in having them, but there should be a distinct separation between "needs" and "wants".