Strong agree from me, though what I do is less involved than the article. I normally just take a few per-chapter summary notes in an org-mode outline, in a filename that starts with the year I read the book.
Recently I started creating my own topic index with pointers to which books I found certain insights in. I know I could generate such a thing automatically with tagging, but I enjoy manually curating my index.
Pretty much what I do as well. I got a Notion account with links to all sorts of things from useful timestamps in videos to chapters in books and docs. It’s been incredibly helpful in contextualising my information when I gotta go out and actually do something.
Recently I started creating my own topic index with pointers to which books I found certain insights in. I know I could generate such a thing automatically with tagging, but I enjoy manually curating my index.