[user104658]

I can see what Alf is saying to be fair; it states that they can't compete "if they've been through any part of male puberty" ... which could (in theory) lead to more people pushing for the use of puberty blockers and other hormonal therapies etc. before the onset of puberty.

There is a LOT of push-back from trans rights activists on this one but the emerging medical and scientific data on this one is becoming increasingly clear: Puberty blockers and hormonal treatments on pre-adolescents can have drastic and permanent consequences. The ethics and informed consent issues surrounding puberty blockers are absolutely massive.

So it's a bit of a catch 22 on that one really.

No female sports for trans women who have been through male puberty, but no delay of puberty is currently possible without the risk of severe and life-altering side effects (ranging from stunted or abnormal growth to infertility, or even cancer).

Then you have the additional worry of people sourcing hormone treatments illegitimately when they're not approved by doctors... that, unfortunately, is not uncommon already. This could prompt more to do it.