All we are saying is that to rely on your own judgement over those with specific expertise in the field in question is very troublesome.
As someone who haunted a evolution/creationist website I can recall that many an engineer trusted his own judgement and felt that the science of evolution was bogus. Kind of reminds me of Dagny. Relating this directly to AS we have an engineer who, unless she was a metallurgical engineer specifically, had one semester on materials and there would be no way to discern physical properties solely from "judgement" of structure and treatment. To truly know physical properties one would have to conduct tests - a lot of tests.
I say this as an engineer.
Now, if you set your world up such that all metallurgical engineers are bad guys and your own "judgement" turns out to be correct then go right ahead but it is not supporting a philosophy in our world.
LOL.
There are several things that need to be understood here. First, if you are an engineer in any mechanical specialty, then you know who Timoshenko was. The "father of mechanics", wrote "Strength of Materials" and so on. Career from 1915 to late 1970s if I recall right.
Where did he start lecturing?
The St. Petersburg Institute for Railway Engineering ... to 1917. Back then...he developed the finite element method (Raliegh method), theory of beam elasticity, beam deflection and buckling theories.
Where was Ayn Rand from?
Born and lived mostly in St. Petersburg, fled to USA 1926.
When is the AS novel cast historically?
1915-1920.
So you are making the error of applying one view of modern engineering to actions and decision making in engineering a hundred years ago, while missing the close parallels between the actual formation of structural metals analysis, Rand's background, and the industry in which these concepts evolved....which is the technical subject of her novel...railroads.
Secondly and more importantly.
What you and others criticizing Rand in this thread and on this subject miss is that part of the essential plot of the book is this very discussion, of individual versus group decision making, of reliance on one's own capability versus government sponsored research.
Thus (and this has been unstated in this thread to this point, but it has been amusing) what you say no doubt you think is original and perceptive, but it exactly mirrors conversations in the book. Rand said what you said before you said it. Because for a conversation, the duality must be presented. Not just Rand's view but also the alternative, which you express. As I noted earlier:
The twisted, sick premise use of the repetition of propaganda is in the book:
James Taggert to Dagny:"On the air. It's going to be a radio broadcast. You're going to debate with him the question: 'Is Rearden Metal a lethal product of greed?' "
.....if you set your world up such that all metallurgical engineers are bad guys and your own "judgement" turns out to be correct then go right ahead but it is not supporting a philosophy in our world.
It is true that in the book the public statements fostering fear of Rearden metal and the many attempts to prevent it's use are actually by "the bad guys", who read the metallurgy reports, knew the metal was actually good, and determined to break Rearden and steal his product. These bad guys operated under the "State Science Institute" and on the surface, talked on and on about how their work benefited the "common good", when actually it only benefited the crony capitalists they were in the pockets of.
But in turn if you knew that a "Metallurgical Institute" or a "State Sciences Institute" was politically influenced and that their statements not scientifically reliable, then you would have zero compunction about disregarding their statements and relying on your own judgement. That would be the only rational course for an engineer concerned strictly with a materials issue, and the resulting process of decision making for maximal profit is obvious. Finally, what you are left with is the issue of clear reason and sound engineering method against contrived and constructed antithetical public sentiment.
So...do you bend over and take it, and sell out to the looters, or stand up and refuse to give away the products of your intellect, risk analysis, and investment?
That's the ethical problem as presented.