Yeah, estrogen does make you lose considerable muscle mass. That really, really shouldn’t be surprising. I used to be able to do overhead shoulder presses at around 40 kg without deliberately maintaining muscle mass. After 10 years of estrogen and antiandrogens, I can’t do 18 kg and that is with active training including a much more careful protein-based diet.

All your example suggests is that the 6’3" trans woman can do is… Something a 6’3" woman can do. Cisgender people aren’t discriminated against because of their natural height, their frame or their reach either, but applying that to a trans woman for something as non-competitive as yoga is all kinds of weird.

While frame doesn’t change much, it becomes much, much harder to use that frame, which becomes a considerable disadvantage. Muscle mass of trans women is less than cis women, our T levels (if properly suppressed) are drastically lower than that of cis women.

Or, to be as pithy as your final comment. Bones and the muscoskeletal system have mass, WTF?

The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command.