Question: Why can't transgender folks use a standard bathroom? Answer: Lawyers and psychologists want to make $200 hour redefining gender.
My county charges $100 for a fortune teller license and when all the dust settles, I am sure they will issue Gender ID Cards like weapons carry permits and maybe by the same department.
When I arrived at USN boot camp, I was soon naked standing shoulder to shoulder with 50 other guys with a Corpsman checking my privates up front and one in back checking who knows what. Locks on lockers were routinely cut for surprise inspections. Muscle magazines were a no-no.
I am told that sexual preference can be checked by showing various photos and if the iris of the eye expands to full open, there is your preference. Usually if a good looking lady looks me in the eye and smiles, I know she is straight.
Conclusion: I have no problem with any group safe to society and I know it must be stressful to hide preference. But I doubt lawyers and psychologist are able to define gender and the only sane way is physical equipment.