Learning to write by hand again
I spend most days typing, so writing by hand should feel like nothing new. It doesn't. A keyboard lets you outrun a half-formed thought — you can type faster than you're sure of what you mean, and fix it after. A pen won't let you cheat that way. It slows the sentence down to the speed of the hand, which is roughly the speed of actually deciding something.
I started keeping a paper notebook again for exactly one reason: I wanted to think slower on purpose, in at least one part of my day. Everything else — code, messages, most of what I write for other people — benefits from speed. This didn't need to.
What it's actually good for
Not everything belongs on paper. Anything I need to search later, share, or edit heavily goes straight into a file, no nostalgia about it. But the notebook is where an idea gets to be wrong for a while before I decide whether it's worth typing up at all. That's a stage most of my tools are built to skip past, and I think skipping it has a cost most of us don't notice because we've never done it any other way.