i think it adds a lot to the themes for gero to be, in privilege, an "average man". because a big part of his design is how open-minded he is. its how kinosaki wins him over in the first place. he cares about people. he doesnt judge them. he realizes he disagrees with the people who hired him over kinosaki being "irredeemable scum" for being practically an escort/sex worker. his sister is gay and everything he does in the story is for her and her girlfriend.
it also uses the expectations of a battle/action protagonist to make gero as charming and real as he is. the action protag is a Cool Guy, edgy, loved by all while blowing off affection, etc etc
gero is cool in battle but awkward socially because he has no experience. and with that blank slate he is strange but open, quiet but kind, and passionately feminist. and that is what makes him loved by all the women.
his worldview is largely affected by the cult clan he was raised in and at the same time he was not influenced by society, so of course he has no engrained opinions on kinosaki crossdressing
this is part of what makes transhet gerosaki really appealing to me, bc it loops these themes around perfectly. kinosaki knows that if she expressed to gero that she wants to live as a woman, he would accept her. and thats a problem, because that means they could be together, but they can't, because she can't give birth.
i have a suspicion that part of the buildup for none of the women "deserving" what it would mean to marry gero includes the expectation of having a child. one of them already has one!- one who would be constantly devalued in comparison to one of gero's bloodline, possibly traumatizing her. gero says he wants a family. and from the start, gero is learning that his clan does not care about the actual, emotional concept of family, just the power structure. and no matter his attempts to compromise, to seek freedom within the structure, he is betrayed.
like him, kinosaki is trapped by societal expectations about love and family. the photoshoot chapter makes it obvious that kinosaki sympathizes with gero's dream of having a family. she wants to see him achieve it, while she believes she can't. she is far more often shown romantically extorting men, playing at being a bride, a wife. the photoshoot chapter makes that desire appear stronger than just money. kinosaki badly wants to be a bride and a wife. something she believes she can never have, because she will always be seen as a man.
she falls in love with gero because he subverts that. he takes her at face value, doesn't value her less for being an escort or a 'crossdresser'. doesn't think it's weird to play at romance with her.
but in order for both of them to live truly free lives, the way gero's clan is structured— the premise that endorces traditional societal values— must be deconstructed.
