What is the point of a woman's division

There are three reasons people will tell you:

1. To allow people with endocrine systems not dominated by testosterone to play in a sport where testosterone has a large effect on one's capability (or, as the cis would word it: to let women play in a game where men are better)

2. To allow women to play in a sport without getting harassed by men

3. To foster female athletes in a sport where men have had decades or centuries of institutional advantage

OK so to the first point, the issue with this is cis people often don't know what they're talking about. For instance, the boxing federation insists on sex chromosomes which has next to nothing to do with secondary sex characteristics. But by now most sports realize it's the hormones that matter. Now, the point of professional sports it seems is to be really good at a sport and break records. People love it when athletes break records, and especially love it when they break the record a lot. Michael Phelps broke a nearly 50 year record on number of first-place finishes for example. Usain Bolt and Michael Phelps still hold a couple records from 15 years ago. Both of their bodies have been studied and had documentaries made about them, and people love to say how genetically lucky they were. So people already accept athletes can be considerably better than anyone else in the world for quite some time. When concern trolling about hormones doesn't work, sports federations who want to ban trans women claim that all trans women athletes will basically instantly be Usain Bolts and Michael Phelps of women's sports. Unfortunately for them, the only female transgender athlete I know of sucked. Another tactic I've seen say World Aquatics use is claiming that sex hormones irreversibly change your bone structure, giving you an unnatural advantage. This is just completely ridiculous. I have seen plenty of cissexual women stockier than me who would be allowed to participate. The actual reason is cissexism: cissexual bodies are natural and allowed; transsexual bodies are unnatural and must be banned and ridiculed.

For the second point, this is plain sexism. Such federations would rather keep their money-making sex pests in rather than foster a safe atmosphere.

The third point is also blatantly incorrect. Skeet shooting used to be integrated. A Chinese woman named Zhang Shan won in 1992. After winning, women were banned from the sport for the 1996 Olympics. Since then it's been segregated. There is a similar story in baseball in the United States. During a minor league baseball game in 1931, female pitcher Jackie Mitchell struck out baseball legends Babe Routh and Lou Gehrig at the age of 17. The day after, the baseball commissioner banned women from the sport. So the actual reason is to obfuscate sex - to make it seem like there are sex differences when there are not. That is, to reinforce patriarchal logic. Interestingly, in their trans-inclusive transgender policy, the ISSF literally admits there is no real reason to segregate by sex. If this third argument was genuine, we would be seeing a move towards integration rather than segregation, and a focus in athletic sciences towards improving female fitness.

The main hypothesis they use is that male puberty is too big of an advantage in most sports even after transitioning later.

Did you know World Aquatics bans all trans women who have had testosterone-based puberty past Tanner 2 after the age of 12, but allows detransitioned women to have been on testosterone for 364 days? I call it the most TERF-coded sports federation.