"How is that different from any women who have a more advantageous body for their sports?" Because non-trans women did not grow that way through male levels of testosterone.

Let me ask you a question. We test athletes for performance-enhancing drugs, and even other drugs - a competitor was suspended for having pot in her system. We do not allow an athlete to take testosterone while competing, even if he was a trans man taking it as part of his conversion. Why then is it OK to allow a trans woman to be taking estrogen?