I think, as from all stories that include a Catastrophe with a supernatural angle, I was hoping we got an explanation for the Rash - what is it really, why did it appear, did humanity need to learn a lesson, did some clumsy god do an oopsie? (To be fair, it is very hard to pull off this sort of conclusion satisfyingly, so even if the ending wasn't rushed, I wasn't banking on it. But it's so good when it happens.)
I hoped to see the fact that trolls are to some degree sentient, yet still mercilessly killed, addressed in some way. Does nobody have second thoughts about it? Have all attempts to communicate with them been abandoned everywhere? Is there really no non-violent way - especially knowing about Pastor A? (On a personal level, ssss made me realise I'm really put off by all stories where the enemies have human characteristics yet are fully considered monsters - why I never liked zombie movies, for instance. It feels too adjacent to the demonising of different people that happens on various levels in real life. When this trope is used in stories, I want to see it examined, not glossed over.)
I wanted to see more about the border guardians! Their introduction was, I think, the last time I was excited about anything in this comic.
I hoped to see more slice of life set in the cities we've seen, but also additional secret communities - there would be so much fun to be had with survivor pockets out there that do life in entirely different ways than what is taken for granted in civilisation as it remains - maybe they communicate with trolls or have found a way to become entirely uninteresting to them? Maybe they keep alive specific technology that is gone in other places? Or have new types of magic? (Shoutout to the fan writers who have done some really cool things with this btw!)
But really, I'd trade all of that for having the main character stories resolved - which, to me, includes expanding on the relationships between them. (Btw this does not mean "haha it's so funny that the Hotakainens only communicate among themselves by verbal aggression, isn't it funny how they're physically incapable of demonstrating warmth? Let's watch this over and over"). Of course, like many others, I was most invested in Lalli and Emil's relationship, but seeing how it was entirely abandoned in the recent adventure, I don't think I'll personally find the ending even marginally satisfying.