That’s a valid argument, but I have heard that taking estrogen significantly decreases muscle mass. Also, there are some female athletes that naturally have a masculine build, which gives them an advantage to the other women. Trans women taking estrogen and competing with men would put them at a huge disadvantage, and it would definetly be dangerous and unfair to have trans men on T competing with women. I know in the 70s there was a huge uproar over a trans woman playing professional women’s tennis and she actually wasn’t that good. Only other solution I can think of is having gender queer sports league and a queer olympics, similar to how disabled people have their own sports leagues