I think this is an assumption you’ve made.
The evidence does not, to my mind support that.
You could have said the same about lobotomies. Just because they were being done doesn’t mean there was a strong enough case for the benefits.
Personally I think both kinds of ‘bottom surgery’ seem to be full of complications, don’t appear to deliver any kind of meaningful results, I’d have huge reservations about these.
Breast implants for men don’t appear to be dangerous, so I wouldn’t object on those grounds. If men want them and are prepared to pay for them, I’d be okay with that.
Hormone therapy, there seems to be growing evidence of the harm of giving women testosterone. This seems to be much more problematic than giving men estrogen, but I might be wrong.
I’d make decisions procedure by procedure