Blazing the last 50 meters, Caster Semenya, a female gay South African, won gold in the 800-meter event at the 2016 Rio Olympics. She stood tall, muscular, and proud as she mounted the podium in Rio. This was her second gold medal in the same event. She has stood on the podium numerous times since she began competition 10 years ago. For many years, she has also faced scrutiny from competitors and organizations alike. As a woman, she has suffered discrimination in a threefold way: by being female, black and gay.
The fact that the research used by the IAAF was flawed does not mean that testosterone is not advantageous either to males or females. It simply means that it has not been proven either way. Yes it would be nice to be fair to Caster but it would also be nice to be fair to the athletes competing against her.
While it is not a randomised trial, the fact is that young boys and girls compete fairly evenly in athletic events up until puberty when performances begin to differ substantially. One needs to explain this developing discrepancy in terms of factors that occur at or about the time of puberty and hormonal changes would seem to be a reasonable candidate until proven otherwise.