Why are transwomen going to ob-gyns in the first place? Obstetrics is for pregnancy and childbirth, which trans cannot undergo, and gynecology relates to the health of the female reproductive system which trans do not have. Gynecologists prescribe birth control to regulate the female reproductive cycle (which trans do not have), insert and remove IUDs in the uterus (which trans do not have), perform pap tests to check for cervical health (which trans do not have), treat disorders like PCOS involving the ovaries and hormonal fluctuations (which trans do not have), help women who experience abnormally painful menstruation (which trans cannot undergo), assist women with improperly broken hymen causing painful intercourse (which trans do not have), and give advice to women about their fertility and ovulation cycle (which trans cannot undergo).
You can't treat doctors like you do washrooms where you go to the one that makes you feel most like your chosen gender. When it comes to health, feelings and affirmation of identity need to be put aside. They should be going to andrologists, or considering what their frankenvags are likely made out of, proctologists.