Not only those essential bodies of knowledge, but anyone who has tried to develop not even a novel product but simply a well executed brand knows the level of almost superhuman focus it takes. Implying that much of what is on the shelf is brought to us by such individuals.

That said, this observation is classically subject to survivorship bias. The real issue is the masses of failures underneath, and those who were never even given an opportunity to fail. Their lives were and are also valuable.