What do you use a notebook for?

Pilot G2 enjoyer here, they almost make me want to maintain my main notes systems on paper. almost

Also another consideration I had about this topic, I don’t own a tablet so often I will use a notebook/pad to draw rough sketches if they’re needed in my Obsidian Vault to better understand a concept or algorithm. I usually just take a photo of the work (as inefficient as that is) and then I can have a physical design to show others if needed.