Writing is used for understanding and for communication. These are two different activities. Ie, the prototype is not the product. Highly recommend the book Thinking on Paper, https://www.amazon.com/Thinking-Paper-V-Howard/dp/0688077587

To those like me who are more interested in thinking clearly and use writing as a thinking tool may find this book more helpful https://www.amazon.com/Thinking-Paper-V-Howard/dp/0688077587