How can it not matter? You have a sport built around the idea of fair competition to a genetic physical weakness, and you think we should just throw that all away? I’m not sure why you are bringing race and nationality into this discussion, that’s never been a race based disadvantage that we decided we needed to design sports around.

Our a priori assumption must be trans people should be included everywhere as much as possible,

I agree, but I think sports falls under “not possible” because they don’t meet the requirements for the women’s league. I have no problem with a trans league, or they are more than welcome to compete in the best of the best league. I don’t think they should be competing in women’s sports, it’s unfair to all biological women athletes who compete against other biological women athletes.

And if you want to compare it to race, where the idea of a race segregated sport would be super controversial, let’s just get rid of women’s sports all together. Women are equal to men, right? They can do anything a man can do, right? What are we pretending women aren’t equal by putting them in their own sports leagues? Let’s just get rid of all women’s sports, let them compete directly with the men, and may the best win.