A pocket notebook doesn’t have to hold everything forever. It’s a good place to sketch an idea before it’s ready anywhere else — a first pass, same as in Why paper, before it moves into a digital tool, a bookmark, a document, wherever it actually needs to live and be found again.
Access to a writing tool matters more than using the same one every time. Pencils sit around home, office, and every bag, so there’s always something to jot with. Pencil first, then a pass in pen later, crossing out what’s done, striking through what’s no longer relevant, adding a counter-argument next to something that was wrong the first time. Still, ink pens remain the real favourite.