I'm not non-binary, but I'm trans and in a lot of queer spaces (or at least I used to be before the whole global pandemic business, but I digress). That being said, what Adira goes through this season, opening up about their identity and finding a family of other lgbtq+ people, that they aren't related to, very much reflects my own experiences and that of non-binary people I know. Just a lot less bigotry and negative reactions and more undead ghost boyfriends. And as far as portraying that bigotry goes, since Adira mostly interacts with Discovery's crew, that would've meant casting main characters or Starfleet personnel in a negative, and frankly in a workplace unprofessional, light, which they obviously wouldn't want to do. Don't get me wrong, I wouldn't have minded seeing more of Adira's pre-Discovery journey and discovering their gender stuff, but due to lower episode numbers we only have so many episodes and the season was pretty packed as is. And frankly, I'm not sure how much I'd trust the Discovery writing staff to pull that off well, especially since internal coming outs, as the name suggest, tend to be a largely internal process that could be hard to portray in a visual medium. IIRC there's a non-binary writer currently working on a DS9 novel, maybe getting them to write an Adira backstory novel would be neat.I don't really think it's a cop out. To me it's a central premise in Trek, providing commentary on current affairs by setting up a similar issue within the context of the fictional future environment. Instead, they took an issue that's trending in society today and basically repeated it verbatim on the show, implying that society has these exact same problems 900 years in the future. It kind of comes back to lazy writing like, "yay, we had a couple of sentences on the pronoun thing, box checked, time to move on". Now, if you are a non-binary person, you were probably happy to see that issue acknowledged on screen, and from that prospective it was good. But if you are not a non-binary person (sorry about the double negative), the scene doesn't carry as much weight because it doesn't give much insight into the life of a non-binary person and associated struggles, etc. To me, that's the missed opportunity, giving a binary person like me greater insight into non-binary people by telling a story about it within the context of Star Trek.
I don't think that's a fair assessment of the state of non-binary acceptance, as we only see them being accepted by everyone. So this isn't really Trek showing a current issue and more like Trek showing us a world in which we have overcome said issue.Instead, they took an issue that's trending in society today and basically repeated it verbatim on the show, implying that society has these exact same problems 900 years in the future
Regarding the Trill, it really is. Having a human be non-binary "be non-binary" because of weird alien stuff, instead of just being non-binary because that is a thing that humans irl are, when there is so little real non-binary representation is definitely a cop out. And it doesn't actually help portraying non-binary people, as neither the bigotry they face aligns with what a joined human would face, nor would their internal journey align with having the memories of a bunch of dead people in your brain and a worm in your guts.I don't really think it's a cop out.