I think the main issue being that it was a forced gender change which is the real issue. And there was never an option to remedy it. The MC was basically r-wordered into accepting that this is his new identity.
If they wanted to go this way in a fluffy type bl then yeah I think that no one should worry about the gender transition, but this case is different since where on the darker section of the genre.

Guys, just don't fight over the things regarding the gender. The author decided the gender soooo... and also, just be happy with their lives dude. Their lovelife is more important than their gender (づ ̄ ³ ̄)づ