Have we seen transgendered athletes dominate? I think there is just one instance of a trans athlete winning a medal at the olympics (as part of the Canadian football team). You could probably count on one hand the number of transathletes that have ever competed at the olympics.
One of the challenges is that we tend to make everything black and white. That science demonstrates a clear advantage. It’s been cited a few times in this thread that 2 years after hormone therapy transgendered women maintain a 12 % advantage for running. What’s ignored is in the same study there was no advantage for other exercises eg sit-up’s and press ups. There are also various other studies that show for running there is absolutely no advantage. Science is not giving a yes no answer. Advocates from either side point to study that aligns with views. The first study of this kind was not published till 2015. This showed no advantage (and has been the basis of rules till recently)
The conflicting science shows that there needs to be a more nuanced approach. We also need to be mindful of the limitations of averages.
To use an anology here’s two distribution curves (not real data)
If you image curve 1 being female and curve 2 being male. You could probably plot similar plots for sporting performance, or hormones or weight or strength. If you then add your professional athletes they likely fall into the far right of their respective curves. We all agree the top 1% of men in most sports will beat top 1% of women.
But take something like sexuality and how that would fit in the curves. Lesbian woman on average weigh more, are taller, longer arms, larger hands. Gay men are the opposite. On average shorter, lighter, smaller hands etc. This translates more professional lesbian athletes than gay athletes. In short they have different distribution curve. Applying averages of puberty of boys vs girls is not always that helpful when talking about what amounts to a different population.
The key to this is what does the population look like. If you imagine a third curve ? Is it in the middle of the two. Is it to the left or right. Is it a fatter or narrower curve. How frequent are outliers ?
It’s not that much of a leap to imagine the very biological aspects of puberty that leads to masculinity (physically and mentally) are more likely to be more pronounced in male athletes. With no (or the opposite) correlation in those transgendered.
Which kind of brings it round to my first sentence. Trans athletes are far from dominating (barley represented in Olympics). Yet represent approximately represent 0.6% of the population. The perceived problem seems to be greater than reality. A sledgehammer approach to me appears out of proportion to the problem.
Take something closer to home, if Liverpool had a trans player in the womens team I would have no problem with that. I would see that as normal. A reflection of the population we all live in. I would not see that as unfair advantage. That’s not a problem for me (even if another female footballers feels disgruntled she lost her place) for me there would need to be a higher bar for sporting integrity to be questioned.