You don't "hack it off". The membrane that become an "erection" is removed and all the rest is inverted into a hole they poke in your crotch. They can then attach many of the nerves back and the tip becomes the female genitals.

Its real Frankenstein stuff, you can actually have feeling and orgasms. How the hell they maintain that shit is what I want to know.

So it is reversible, although complicated and painful. You still have your "junk' so to speak. You don't have your nads anymore however, and with women, they remove ALL YOUR FEMALE ORGANS including your womb, so, NO. Many do opt out of that part and just get a dick installed.
Surgery for WOMEN to MAN is far more complicated and dangerous and involves many more surgeries. People who do this are mostly insane.
I do believe a very few people are transgender and were with no pressure from anyone to do so.

The youngest they have outed is Kim Petras the Pop star, she had the surgery at 16 and is now 24. She is amazing. Of course there are many others in private transition. I'm sure some kid out there has had the surgery before puberty. Kim Petras started meds before puberty to stop it. She has better hair, skin and is prettier than most females.

It's a double sided coin so to speak! And it's not new this has been happening for thousands of years.