Briefly, I have 2 sets of notes: a zettelkasten -with short, atomic notes - and a Geopolitical collection with (very) long notes.
In the zk, thanks to Obsidian, I have suddenly started links/relationships more clearly. From there I can construct what I call “story rivers” (term borrowed from TiddylWiki, though with a somewhat different meaning).
The story rivers tell a story based on a combination of various notes. A story river is nothing more than a series of transclusions interlaced with some comments, views, conclusions.
With my Geopolitical notes I am starting to do the same, and transclusions also allow me to shorten the notes (apart from excising parts) by not having to repeat a section of text, using a transclusion instead.
1 additional transclusion functionality I would love to have is more to be able to go 2-3 levels deep of transclusions. There is a feature request in for it, but I am not so sure it’ll get implemented.