You know very well that for every one person that shows a good response to drugs there are literally thousands that are juicing that don't. Many are on this board.
Drugs are a necessary but insufficient condition to get to the pro level. It's all genetics. And it's like that in other sports as well. It wasn't just hard training that made Michael Jordan a legend. A lot of his contemporaries trained just as hard. He was a gifted human being.
I only know what I have witnessed from an empirical standpoint. My friends and training partners in the 70s and early to mid 80s along with several 70s era champions from the original Gold's. Off drugs they were normal to a bit above average. We all knew this was going to happen and they had no problem because they said they did NOT want to abuse their bodies because no one really knew what too much was or what too much would do. Do you recall when Robbie Robinson first tried to remain "in contest shape" year 'round?
Supposed congenital heart problems, that's what happened.
And Dr. Walczak was a schmoe of the first order. No...He never came on to me as he knew better or so my friends told me. But a few of my friends, one in particular, were offered training time in Palm Springs and assistance with their supplementation. Yuck!
I have no doubt that drugs work. Do they work better on some than others? Sure. But the mere fact that they work as well as they do on "woMEN" shows me that it ain't "genetics". Be well, brother!