True enough, but it probably wouldn’t drastically increase scope to include some flavor lines that reference a gender difference. Whether it be appearance or small mannerisms or whatnot. It’s been mentioned already, but Fallen Hero does a great job of it with Ricardo/Julia and Dr. Mortum!
People who complain about gender variant ROs not being “feminine” or “masculine” enough usually have some own personal issues they need to work through and don’t understand what gender actually is.
Definitely rather have a gender-swappable MC—but I’m very attached to my gender so that’s a personal queer bias of mine. Although I do also really enjoy M/M and F/F (and NB) locked games because the representation is much needed.