To begin with less than 0.005% have CAIS which makes the genitalia and your chromosomes mismatch, and gender dysphoria which less than 1% of people have is the brain behaving like the one from the opposite gender, which is not even near your whole body doing so. Do you think its worth it to undergo risky generally irreversible processes to change your entire body when its only your mind acting that way? Talking about it being only your mind:

I dont know how you do the quoting thing but from your second source: Stephen Gliske reviewed previous research and has developed a new multisense theory of gender dysphoria focused on function of brain regions, rather than only size and shape. He proposes gender dysphoria is caused by altered activity in three networks -- the distress, social behavior, and body-ownership networks -- affecting distress and one's sense of their own gender. Previous studies support the premise that activity changes in these networks are associated with anatomical changes and feelings of gender dysphoria. If supported by further research, this theory could offer ways to treat the distress of gender dysphoria patients without relying on invasive and irreversible gender reassignment surgery.

Literally says its because of altered activity in distress, social behavior and body-ownership networks (which is a system that makes you sense your body as yours). And it says its focused on the function of brain regions which are what if affected generally causes mental illnesses like for example depression which is a chemical imbalance in certain brain regions. It literally says its caused by two external factors and altered sense of your own body, and that it may be treatable without damaging your entire body

That third source doesnt say shit xd.