while i get that adam was supposed to be treated more like an object than a character, i really wish we had gotten to see him interacting with rachel. rachel's purpose in the story is being Adam's Sister, and the only thing they really do with that is having her blurt out that flan wrote the letters (which doesn't change much since kate doesn't believe her.)
especially since adam's parents get development through flan's edits, talking about how they acted on tv, but rachel isn't even mentioned. she always seemed like the nicest member of her family and it looks like she and adam are pretty close so it would be interesting to elaborate on that.
the only person who even really talks with adam other than flan is kate and i think there's a missed opportunity to see him interact with a non-love interest. also i find the concept of choir prettyboy + his goth sister extremely funny