Thinking happens at the board, not in the doc
Documents are honest about order and dishonest about structure. Whatever you typed first sits at the top forever, radiating false importance, while the actual shape of the problem — what belongs with what, what causes what, what's missing — hides between the lines. The board inverts this: position and distance become meaning. Two notes drifting toward each other across a canvas is an act of reasoning no outline can perform.
Why the hand matters
Sketching recruits spatial reasoning that typing leaves idle. When you draw the arrow between "signup flow" and "churn," you're forced to decide what kind of arrow it is — causes? feeds? blocks? A bulleted list never demands that honesty. And the crude drawing is a feature: a wobbly hand-drawn box invites correction in a way a crisply templated diagram doesn't. Polish signals finished; finished repels thinking. This is also the argument for markers over slide software in every meeting room that still owns a physical whiteboard.
The dump-cluster-connect-crop method
The solo session that reliably works, using nothing but this board: Dump — sticky note per thought, ten minutes, zero judgment, the note wall preset exists for exactly this. Cluster — switch to the move tool and drag what belongs together, together; name each cluster with big text. The clusters are findings: they existed in your head, unlabeled. Connect — draw the arrows between clusters and say what each one means; the arrow you can't justify is the assumption you needed to find. Crop — export the PNG, and write the doc afterward, from the board. The doc is the report of the thinking. The board is where it happened.