Thanks for recalling the earlier discussion. It includes testimonials to Emacs org-mode, and to the Zettelkasten package built atop org-mode, org-roam.
Org-mode can't be beat, IMO, if you live in Emacs all day long, as I do.
One thing I would really like for my notes is some sort of AI or fuzzy thesaurus-aware search, so I can enter a search phrase and get "similar" matches from all my local files, not just "exact" matches like you'd get from grep.
Does such a thing exist in emacs?