Question for you. Do you think the yellow book is 100% correct? Honest question.
My opinion of TGM is very very high. Why? It has helped in the growth of the greatest instructors in the game. Not all of course, and it would be unfair of me to try to name them because I would certainly forget one, but for example most of the instructors on this site have developed from someone very close to TGM. There is 3 degrees (the whole Kevin Bacon joke) at most. Point being tons of it is right on and it has forced people to think and the brightest minds have learned a great deal from the yellow book. Also some have moved away from it, but if we sat them down they would no doubt tell you it had a profound influence on them at some point in their life.
That being said, I do not think it is 100% right. With Trackman and 300fps video we have learned more. Tons more. I think Homer would have loved these innovations as most engineers would. He could verify or find flaws in his theories and re-write some of what he wrote. We would be on the 22nd edition.
I will also add, considering what he had to work with he sure did get a bunch right.