[graboid]

Generally agree.

There is a case for writing down the stuff you learned though (into your notebook, app, zettelkasten, whatever). When I try to note down a concept I learned, I feel like sort of explaining it to myself. And often, I will quickly discover holes in my understanding. A good note-taking software can also point out connections to other stuff (mostly in the form of other notes) I maybe wouldn't have made. Maybe others don't need that, but I am bad at making connections.