Or if you changed your gender identity at a young age, you must have experience of the changing room/toilet dramas at school and have some perspective to offer there.
I hear your point barnhen but can you see that there is still a vast gaping chasm in the type of experience between the two.
The young male born trans person is still generally known to be male, especially by the adults that hover around and make many special accommodations.
I was told by my daughter's school that if she didn't feel comfortable changing with a male born transgender person, SHE was the one who had to leave her friends and find somewhere else to change. She is not being treated in the same way as the transgender person. The transgender person was being given a free choice of three types of locations to change - she is being told to put up with her discomfort or leave.
It is inevitable that they are treated differently because they are different, and I'm not saying that being different is a bad thing but it means you can't equate the two life experiences.
At the end of the day, you can't replicate 'lived experience' - you either have it or you don't.
Many people that are purporting to speak for women in positions of influence have been transitioned for a tiny proportion of their life - that isn't the same has a woman's lived experience of being female and all that entails from birth. Our entire lives are shaped by our sex.
We also have the practical girly nonsense to deal with like trying not to get pregnant, dealing with periods, etc etc that someone not born female can never be included in.
Those things actually affect our lives, and our earning power and social position. From the times I had to go home from school because I had fainted in biology again because of my periods or the girls in my school who had their education cut short because they failed in their quest to not get pregnant age 14-16 (quite a few). The men who got them pregnant didn't have the education limiting experience that they had.
Women need to have our own voices (am I seriously saying this in 2021!!) - we are the best advocates for our own needs, we don't need anyone who is not a woman to speak for us.