The problem is that fundamentally there are differences within the genders that favour one competitor over another.
Take Michael Phelps – “Michael Phelps’s height, wingspan, and large hands and feet give him an advantage in swimming. His body also produces less lactic acid than his rivals, which shortens his recovery time.” According to that he should have been disqualified from competing as his body was fundamentally different from his competitors.Yet he was glorified for his achievements even though he had an edge nobody else had.
Herein lies the biggest issue … trans people are disqualified for the simple reason nobody in power wants to deal with them, so the anti-trans movement wins again.