On average, in terms of speed or upper body strength, women are lesser. Just as, in terms of heart health, men are lesser. Take a quick look at track and field records or actuarial tables if you doubt either comparison.
You are defending a counterfactual equality claim in an irrelevant arena. Women, on average, are not the athletic equals of men. Just the same as men and women are not equal in height or longevity. Of these, only longevity means much.
Why tie yourself to a claim that does not matter and is so easily disproven?
Well, because the entire justification for equal pay and resources for equal sports has been that they are not lesser, just different. You've undermined the entire foundation of title Ix and the USWNT quest for equal pay.
Also your line lacks a coherent rational. "Biology" would be one...but that means ftms should be allowed to compete against the dds if they so choose. Testosterone levels are another, but that means some dd should not be allowed to compete in the lesser division either.