This is the very issue at the centre of all this.
Let’s take swimming. In almost every event very very few men are capable of posting a time capable of making an Olympic final. But many men can post a time that would make the women’s final. Let’s take the 100m freestyle at the 2012 Olympics.
The slowest time swam in the 100m women’s final was 54:02. The winner swam 53:28.
If we go to the men’s heats , 45 men swam a faster time than the slowest woman in the final. And 43 men swam a faster time in the heats than the women’s gold medal winner.
You can do this kind of analysis is most sports - it’s very obvious in sports with objective records like times.
So the future of sport (particularly if you start to think about financial rewards slowly building in women’s sport) might start to look like men dominating men’s sport and trans women (aka humans born with a Y chromosome) dominating “women’s” sport. There won’t be any humans with two X chromosomes in “women’s” sport in the foreseeable future, or at least in sport where there is reasonable money/ status to be obtained.
If I was born with two X chromosomes and I was a professional sport player and someone else turns up with a Y chromosome (and had their teenage years with testosterone coursing through their body adding bone and muscle mass that I couldn’t achieve) who then “identified” as a woman and said they were not only competing against me but taking away my spot on the team, local team, state team, national team, Olympic team etc …. well how would I feel about that? And the current nanomoles of testosterone of that other person really doesn’t matter now that they are 10kg of muscle mass heavier, 15 cm taller and can achieve a VO2max no person born without a Y chromosome can achieve.
Reference men’s results https://en.wikipedia.org/wiki/Swimming_ ... _freestyle
Reference women’s results https://en.wikipedia.org/wiki/Swimming_ ... _freestyle