^ That's an interesting take, and one that I hadn't thought about before. But my arguments for YunaAno aren't based on the fact that they're inherently better than YunaHina, so much as the fact that they had the potential to be. Certainly, they've both got issues that would hinder a possible relationship, but so does every other character in the cast, and Kindred Spirits is a story about overcoming those anxieties and having to courage to hope for something better instead of settling for the status quo. Ano's penchant for observation and non-participation is an obstacle to relationships in the same way as Miki's savior complex, Aki's devotion to the rules, or Tsukuyo's position as a teacher is- without those obstacles, you wouldn't get the emotional payoff of characters growing, developing, and finding new happiness.
It'd be different if Ano was written as ace, or if the story explicitly engaged with her anxieties and views despite her not being in a relationship- Nena, for instance, despite staying single, has a clear arc where she learns to quit counting on other people to read the room and actively clarifies her feelings. Ano, at least as far as I could see, has no such moments whatsoever- it feels like the writers planned to make her important, gave her 'main trio' billing, and forgot about her halfway through the story. I'm not salty about what we have, so much as the wasted potential, hence my arguments for an Ano route as opposed to a pure, YunaAno-exclusive canon. If the writers went the other way, I'd make the same arguments about why Hina was underused and wasted as a character, because I just want the same standards of writing to hold true for everyone, and they almost do.
One of the greatest strengths of VNs as a medium, in my opinion, is to capture multiple perspectives and scenarios instead of adopting the absolute linearity of a paperback novel. Kindred Spirits actively uses this system, since we do get to inspect the same events from different perspectives in Calendar mode, so it's not like the writers were opposed to using the medium to lend the story depth. Ano's the only one who gets screwed out of this, and no matter how hard I strive to think that the writers intended for her to be a minor, detached character, it just doesn't fit with every other aspect of the novel. I'd get it if Kindred Spirits was a manga or a tv series, but definitely not if it was a VN.
To give you a less subjective and philosophical example, I'd use the Flowers series of yuri VNs. Like Kindred Spirits, the VNs have one canon romance, but also include a route for one or more non-canon characters that lets us see how the relationships pan out. One of my favourite examples is from the first instalment, wherein our protagonist has to choose between a somewhat distant, but supportive girl who she admires, and a more controlling, obsessive girl who's closer to her. The first is the more healthy relationship, and is represented by a flower on the interface blooming as our protagonist gets over her social anxiety and learns to be more expressive and confident, which factors into a long-term character arc. With the second route, the flowers wilts, representing how our protagonist's individuality is suppressed as she's suffocated by co-dependency and emotional manipulation. I love how the writers didn't just say, "The main relationship is better, just take our word for it,", but actually put in the effort to demonstrate why the non-canon relationship would be problematic and unfeasible. They used the medium to brilliantly express the message they were going for, and created a story that was truly unique and did justice to everyone involved. Obviously, Kindred Spirits had its own circumstances, and presumably a much smaller budget than Flowers ever did, but that's exactly why I'm a lot more inclined to think that they ran out of the time and resources required to write an Ano route instead of just planning for her to be a walking plot device all along.
Still, I'm grateful for the post you made, because it expanded my perspective and made me think my arguments through instead of taking certain assumptions for granted. Thanks.