> Paper books are also just orders of magnitude easier to flip through and re-read specific chapters, paragraphs or sections.

Whatever works for you, of course. PDFs have bookmarks, which instantly take me to a specific spot on a specific page. Also, I can open multiple instances of the PDF, viewing multiple pages of the same book (or some PDF readers allow split screens to do the same thing). Edit: And if I don't recall where something is, I can search for it.