One thing that kinda disappointed me was that they decided not to do any cross-route supports. Now, I know Alm and Celica sides don't intersect for 99% of the game, but part of me wishes that they implemented these for postgame, because I feel like there could have been some interesting interactions between people from the two sides. Also gives me something to do after I'm done with the main story.
Some convos I would have liked to see:
Alm and Celica (duh)
Alm and Conrad (overprotective brother?)
Silque and Jesse (literally what is the point of their Memory Prism if all they get is a Passive Support)
Celica and Faye (Faye doesn't hate Celica, so I guess it would have been interesting for them to talk. It could have redeemed her in people's eyes, depending on what exactly they talk about.)
Kliff and Atlas (A kid who's bored with his village life, and a man who has a family to return to at his village. I think there could have been interesting development for Kliff.)
Mathilda and Palla (both are older sisters, but one of them got what they wanted...)
That's all I can think of for now, but what cross-rotue convo do you think would have been interesting?