I think the biggest example of unfair advantage is drugs. There are lots of people who have had medals upgraded after someone who finished above them was later disqualified. Why is it acceptable that even one drug taker takes an opportunity from a woman? Ever? Even one?
It is not.
But your comparator of African national adults competing as children should also not be acceptable? Not sure why you mention it to counter allowing any male who has benefited from male puberty into female sports, or were you agreeing with me?
I don't follow a lot of the sports mentioned (I didn't know about TW in county cricket or the Chinese Olympic basketball team). I thought what they had done in athletics was fairly sensible (if I understand correctly the likes of Semanya and Niyonsaba (I think intersex rather TW) couldn't compete because of excessive testosterone).
It was not sensible at all. It is clear by now that these athletes have benefited from a male puberty where testosterone viralised their bodies. The fact that some events allowed them and not others was due to the OIC demanding direct evidence of advantage and being pedantic about only setting the guidelines for those events they saw as having had problems in the past. It left the other events open.
Do you really think that an 18 year old athlete would be able to change events within WEEKS of that event running, have a very dodgy start and still win a silver medal if that 18 year old athlete was a female?
It is the viralisation that occurs due to that body having testes (undescended or otherwise) that provides advantage. I am very happy to link up studies if you would like.
In fact, it has been observed that even 6 year old boys have advantage of 6 year old girls so it is not just puberty, but puberty is the driver for fairness in adult competitions.
So, I disagree, they were not sensible at all in the face of the science that was known even at the time of these decisions.
That an athlete can still win a silver medal despite not having trained in that particular event is not that that athlete is a superstar, it is that they have an unfair advantage over the rest of the field.