You seem pretty concerned about the surgical removal of healthy body parts. To which I would say: Other people's bodies—and other people's body parts—are theirs, not yours. And if an individual wants or needs to change or even remove some part(s) of their body to be who they are or to be happy or healthy, I'm sure you would agree that they should have that right. Again, not all trans people get surgery, top or bottom, and many trans people change everything else (they take hormones, they get top surgery) but opt to stick with the genitals they were born with. (The ones they were born with tend to work better than the ones that can currently be constructed for them.) But unless you're trans yourself, currently sleeping with a trans person, or about to sleep with a trans person, NSFM, it's really none of your business what any individual trans person elects to change.