I agree and think this has always been the case. The process is one thing, the skills and knowledge to apply it can only be learned through experience.
Example- I have some reprints of 19th blacksmithing manuals. And although they might describe the process of welding an axle, or forging a wrench, it always assumes that, as the reader, you know what a welding heat is, about the correct temperature for drawing down, how to make the tools required to make the tool (first forge an eye punch of 1 inch) and so forth.
If you have never got your hands dirty doing the work, whether smithing, working front line support or deep in the code base (something I cannot do but admire), you simply don’t know.
And as you say, from that lack of knowledge comes the ignorance that leads to a misunderstanding of value and need.