FWIW, I have a general notes system (in the genre of Obsidian / Notion / Roam / LogSeq / etc.) and also a Zotero full of downloaded articles and books. I keep almost everything in my general notes system … but I also sometimes attach individual notes to things in Zotero. These days those Zotero notes are usually one of the following two categories: (1) a note that just says “See my general notes”, indicating that I have written something about this article into my general notes system (and then I can go find it by searching for the author’s name, if I want to), or (2) a list of acronyms / jargon that are specific to that article and that I don’t already know. I can imagine using LW private notes for those same two things, just like my Zotero notes, if such a feature existed. It’s very low priority for me, though—I’m getting by just fine as is.
FWIW, I have a general notes system (in the genre of Obsidian / Notion / Roam / LogSeq / etc.) and also a Zotero full of downloaded articles and books. I keep almost everything in my general notes system … but I also sometimes attach individual notes to things in Zotero. These days those Zotero notes are usually one of the following two categories: (1) a note that just says “See my general notes”, indicating that I have written something about this article into my general notes system (and then I can go find it by searching for the author’s name, if I want to), or (2) a list of acronyms / jargon that are specific to that article and that I don’t already know. I can imagine using LW private notes for those same two things, just like my Zotero notes, if such a feature existed. It’s very low priority for me, though—I’m getting by just fine as is.