Most successful doctors don't know shit about endocrinology or biochemistry (or even nutrition for that matter). It is a necessary side effect of having a very broad range of knowledge, you could also accuse the specialists of having too narrow of a range to diagnose a patient properly.
I have posted on this extensively, including research. In males, the standard daily dose of all three 3rd gen AIs is almost exactly the same. Beyond that I have done some of my own research on myself and also found the same exact result.
Letro at standard daily dose (2.5mg) reducing E2 by 50% in males.
Letrozole once a week normalizes serum testosterone in obesity-related male hypogonadism
Arimidex at the standard daily dose (1mg) reducing E2 by 50% in males.
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Aromasin at the standard daily dose (25mg) reducing E2 by 62% after 12 hours in males. 38% after 24 hours (average of 50%).
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My own results comparing Letro with Aromasin (Aromasin at 20mg not 25mg unfortunately).
http://www.professionalmuscle.com/forums/beginners-forum/65807-estradiol-1g-test.html
I could explain the likely reason why they are weaker in males, why they all work about the same, and why you cannot block higher amounts even with much higher doses, but that part would be pure broscience (although I would call it a hypothesis based on knowledge of biochemistry). I know some of you are aware of my theory.