I think a finished text can afford a certain amount of loose ends. There are Plot loose ends and Character loose ends.
Plot loose ends should be minimal, though one or two are ok. Character loose-ends should also be minimal, but you can cut yourself a little more slack. Say character A is the protagonist, and character B is the antagonist – sure, it’s best to tidy up the loose ends in regards to the plot, but their characters can be a tiny bit opaque. And K, who is a one-off character and only appears midway through, well he can afford lots of loose ends. K only needs to be tidy in regard to the narrative. The rest can be messy.
So long as loose ends don’t confuse, so long as they don’t, in some way, thwart the final act, they’re ok.
But not too many.