I want to give some really important context to this: it was a classic “throwing the baby out with the bathwater “ argument.
Of all the many types of DSDs that affect people born with XY chromosomes, Complete Androgen Insensitivity Syndrome (CAIS) is one of the rare ones that confers no male puberty advantage at all. That’s because no matter how much testosterone may be circulating inside your endocrine system, your body is completely immune to it. People affected by this have zero male advantage, apart from possibly being a bit taller than average. They grow up looking completely female on the outside, with pretty typical female muscles and speed and strength and pelvis width and everything.
But CAIS people were used as an example of whataboutery to show the flaw in a straightforward argument that “all XY people have an advantage because of going through male puberty”.
It’s actually quite simple to separate out CAIS from other people with XY chromosomes, your genetic test comes back showing you have XY chromosomes but then they very quickly establish that you no receptors and therefore no male puberty and no male advantage. And CAIS women tend to be pretty shit at sports anyway due to the aforementioned lack of testosterone. But hey go, that’s where we are.
Can’t do sex testing in sports because it might theoretically offend a small bunch of people with a DSD who actually want to be left completely out of it anyway.