Biology is unfair. Some people born with a bigger heath that help them in athletics. Some people is taller, some shorter. Sure, some trans woman might have advantage, while others would remain bad at sports.

And we tend to forget the sports where women have and edge. Apparently, when it comes to ultramarathons, women have some kind of advantage. And the fact that we need less oxygen comes in handy for hiking.

Some sports doesn't make gender distinctions. In the long term it would be a gain. To me is more important that girls are encouraged to practice sports, than the actual hormones they have. If a trans woman becomes a star, then maybe it would be girls who want to join the sport. And that would be good.