I always found writing to be an unnecessarily arduous tool for communication, so I never do it until I've overthought what I want to express and approximately how. At that point I flesh out the skeleton of the message, and pile on words and structure and references and other rhetorical tricks until the packaging feels sufficient. Rarely, if ever, have I experienced writing things down altering my perception of the strength or weaknesses of the chosen arguments, or revealing new ones. That is to say, I really don't vibe with the concept of writing being thinking, rather it's a waste of humanity's resources to push it as The Tool.