While I can see that both arguments have valid points, there's a part of me that says that if McKinnon doesn't see the advantage of a higher testosterone level, than she should just compete on the men's circuit.
It seems to be a problem with no easy answer. Could it be that there will be trans women and trans men events in the Olympics in addition to women's and men's events?
https://www.usatoday.com/story/sports/olympics/2018/01/11/these-transgender-cyclists-have-olympian-disagreement-how-define-fairness/995434001/
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"Women are judged on their success, men on their potential. It’s time we started believing in the potential of women." —Muffet McGraw
“Thank you for showing the fellas that you've got more balls than them,” Haley said, to cheers from the crowd.