Walls make it easier to iterate.
Digital things look ‘finished’ too soon. when something is a work in progress on a wall, it looks unfinished, so you keep working on it. moving things around, reshaping things, connecting things, erasing things, and making them again.
—Leisa Reichelt, in ‘What walls are for‘
… post it notes are still the best tool for research analysis for exactly this reason – no one ever does three (or more) rounds of synthesis using a digital tool.