I use notebooks, notepads, blanks sheets of paper, Japanese A5 and A5 notepads, and Pilot Frixion erasable pens.
I do mostly writing, and also diagramming (I'm a software developer) with the odd doodle and 3-d house.
I'm very picky about pens, very picky about paper.
I also definitely want to keep my notebooks.
I do not want all this stuff digitized. At all.
What I do digitize, I convert carefully, taking care to craft it as well for pixels as I did for paper.