The implication always seems to be that someone would actually change their body and life so that they can finally place in e.g. women's swimming, a sport most people don't care about is idiotic and while it potentially applies to some people, they're outliers.
The difference between Derrick Henry and me at age 15 is far greater than my "natural physical advantage" over women was at that age. The reality is that a lot of sports aren't just "work hard and you can be the best" and if it so happens that someone who transitioned to female in your sport happens to be better...it's basically no different than another woman who just happened to be born with better genetics than you.