Hello, Pepe, that’s is very true from what you say about Yukito, about internalizing his character and pushing him to not give up on his quest to find the girl in the sky (even if she’s not in that town), but also helping those around him while trying to search for the girl in the sky.
In fact, he was able to help Minagi with her problems and get her reconcile with her mother and Michiru, who is the spirit of very likely her diseased sister in the past. This allowed Minagi to come to terms with her family problems, as seen as she tells Yukito the next morning before he leaves town to continue searching for the girl in the sky that she got a letter from her father that she can visit to see her new younger half-sister, who looks like Michiru (after she vanished in front of her and Yukito after seeing that Minagi can go forward and not have regrets). That is Minagi’s True Ending, the ending where Yukito was able to actually help her with her problems without runnning away and that he still hasn’t given up on his quest.
This is contrasted with Minagi’s Normal Ending, where as discussed here, Minagi is just running away from her family problems, and even Michiru can no longer help her. Sure, Yukito asked Minagi to come with him so that he can show her the outside world (and not a dream), but he’s forced to give up on his quest to search for the girl in the sky to do so! This doesn’t help with Minagi becoming dependent on Yukito, where she NEEDS to be able to handle things on her own. As we see, Minagi and Yukito leave town via bus, but it still isn’t on resolving her problems and it’s only a matter of time before they bite both of them in the butt.
That’s why I liked Minagi’s True/Good Ending because it helped her resolve her family problems with Yukito and Michiru’s help (before the red-haired girl vanishes after seeing that Minagi can now move forward with no regrets). Of course, Minagi tells Yukito that she’s going to her father’s home to see her little half-sister just before he (Yukito) leaves town. I think I’m getting this at least in the right interpretation, correct?
However, it doesn’t excuse that Misuzu and Kano are just blatantly gone in this route, with the former saying good-bye to Yukito. In fact, both of them no longer appear in Minagi’s route as we get into it. What the heck? Again, this is one of the biggest problems that AIR has, as you just stated, Pepe.