However, there is absolutely no proof that this is a matter of brain function though. That is a theory, but research has been done and has not come up with anything. Whereas there is plenty of findings to discuss regarding autism etc that show what might be able to assist with diagnosis in the future.
And because there are many aspects of people claiming gender identities, including teens claiming that they personally are doing this as a lifestyle choice on social media, if it in the very distant future limits who is transgender and who is not, will that be even welcomed?
Being purely theoretical though, with absolutely no indication that there is any foundation to that theory at all, why have politicians and policy makers been so convinced to deprioritise the necessary sex based protections needed for female people to prioritise a group of male people with gender identities to allow them to access any provision set aside for female people (and when I refer to female people, I mean female people of any gender identity)?
So, at the moment what we have is a group's philosophical belief about their own identity being prioritised above another group's proven sex based needs. Which other group in society has been given these extra privileges based on a philosophical belief?