I feel like I get where a lot of people are coming from with this manga being 'old fashioned' in terms of how it views the main character but here is the thing... I don't know if it's meant to focus on Hanase. I mean think about it, right now it's the childhood friends who are getting the real character development, they're the ones questioning themselves, what it means to love someone based on sex and gender, what it means to be with a person and have feelings for them. Ritsu is the one who asks what it means to love someone, and how they would feel if that person was the same sex or opposite sex. Meanwhile Shiori is a bit more confident that their feelings wouldn't change, but he still pushes for a female Hinase. He is the more aggressive version of Ritsu, same coin different side so to speak. I'm not saying these characters are perfect, I am far from an expert in these things, but at least to me it feels more like a story about two people learning and growing their understanding of their own emotion more than a story of someone who is trying to figure out their own identity. As others have stated Japan's views on these topics is much different to our own, and it's hard to compare the two, but with this view point I feel like it makes a lot more sense and actually has some smart things to say, though whether you agree with those or not is a different story.
Besides the real question is how the fuck does this person use the bathroom like seriously I feel like it's implied they're very Ken/Barbie Doll like so just how does that work waste products are still a thing you know? I'm scared to think about it too hard I do not want to go down this rabbit hole but I can't unthink it