I use this method of thinking because my memory/concentration get worse sometimes and do that with age. Even a simple file or a piece of paper work like a huge L2 cache which you don’t have naturally. Outlining (indents basically) makes it even more navigatable, e.g. I write simplified sentences in a hierachical way and use that as references/structure of thought.

  Thinking by writing
    Enhances memory as L2 cache
  Simple file or piece of paper
    Outlining by indents
      Makes better navigation
      Easy references
      Allows structure overview

I usually write 2x longer sentences, the above is just an example.