There is big confirmation bias here as well
Nobody photographed the fat pimple looking beanbags, or the steroid hypo responders. The best physiques, got the best attention. And the people who were prone to being in that group were also the ones most interested in the sport given how much infancy it was in back then
In that era you saw the cream of the crops in pictures; Joe Weider didn't really care about representing the average man on gear, he was building a herculean image of his brand and athletes
You give Arnold the same drugs and methodologies of today, and I guarantee it would be a positively jaw dropping result. He wouldn't suddenly turn into some ugly monster because he used more testosterone