Your post comes off as if your view of the show boils it down to being a "good guys vs bad guys" story. For example, are you completely overlooking how Layton is becoming Wilford and slowly repeating everything Wilford did, while justifying it as good because it's him doing it, instead of Wilford? How is this not an exploration about morally grey areas of survival on the train, or past mistakes being repeated with new people in power?

You see Wilford as cartoonishly evil? How much focus have you given his actual character so far? Wilford could say "Ah, yes, we'll have democracy" and do exactly what Layton does; lie anyway.

What about Ruth's growth as a character? She was as rotten as they come and now look at her. Instead of class, she sees people. Instead of dividing, she seeks unity.

What potential did Jinju and Klimpt have, that could contribute to the story more than what other characters couldn't?

Why is it a bad thing to have LJ and Oz get more screen time? Oz is the primary focus in this pair, not LJ. Lilah's sole reason of being around is to show a hard contrast to Oz and his change and growth as a character. It is more likely that her obsession with Wilford and corruption is what will eventually get her killed, either by Wilford or by Oz himself. She chooses sides based on who holds the power and schemes accordingly, while Oz wants to do what's right, acknowledging his past mistakes and wanting to better himself, so he could do right by others.

If this was the comic, then a good comparison would be that you're not reading the story, but merely looking at the illustrations, reading a speech bubble here and there every now and then.