Pacing is fine to me.
There a whole lot of shit to resolve, characters with actual moral depths and dilemmas, and the author has a story to tell that doesn't only revolve around romance.
As readers, I think we should get more used to stories that take actual time to explore and resolve drama. Instead of stories (like there are so many, take your pick) where tension is quickly resolved, because the sweet conclusion is the entire point, this one is about the way the tension holds and impact the plot and characters.
If you want a quick resolution instead of actual angst, I suggest you simply do not read this one.
I don't think readers need to "get used to" slow storytelling. Plenty of very slow stories are compelling. The question is whether the time spent actually develops the story or whether the narrative is treading water. As a writer myself, I've had to learn that distinction too: something can be important to the story I want to tell and still be boring in the way I'm currently telling it. "There's a lot left to resolve" explains why a story is long; it doesn't automatically make the pacing good.
Looking for a manga i read as child.
It was in the children's section of the library but i think it was (soft) horror. It was probably already out in 2008/2010.
The protag was a woman, who i think was a shinigami and she could turn into one of those little origami angel (?). She answered to a man who would send her to kill/take the soul of people and send them to ''''hell''''. I'm pretty sure one of the plot point was that she had memory issues. I think it was mostly set in 'historical' japan, but maybe it traveled between ages.
There's this scene i have in mind where she takes a man's soul (a general of some kind) while he is either running or riding a horse and she just pushes her hand on his forehead and his whole skeleton comes out.
I know i didn't fever-dream this but i've never been able to find it. (╯°Д °)╯╧╧
I'll forever be mad that this got axed.
But for such a sudden decision from the editor, I think the author did well with the last 4 chapters she was allowed. (At least I think it's 4, my memory's not so good)