Sounds like a great book. Nearly all of my friends are trans, as I like to be around other trans people. It’s nice to be understood without constant questions. I’m an adult and I live in a very queer area. For younger queer people that live in more conservative places, full of people that don’t understand them or are actively hostile, stories of healthy queer community can give those people hope for a better life. These things are extremely important to a lot of young queer people and even as an adult I prefer stories that have realistic trans representation for people like me - which means everyone is some kind of queer.
It sounds like the story just wasn’t for you but it strikes me as totally realistic to have a book with primarily or only queer characters. These people congregate in groups because they understand each other better.
It doesn’t strike me as realistic at all. Queer people need to be able to deal with heteronormative people as much as the reverse.
Otherwise you’re just self selecting into ghettos. I don’t think it can really be avoided, but to present it as desirable strikes me as wrong.