To quote Paul Graham: "Writing is thinking. To write well you have to think clearly, and thinking clearly is hard. In fact there's a kind of thinking that can only be done by writing. You can't make this point better than Leslie Lamport did: If you're thinking without writing, you only think you're thinking. So a world divided into writes and write-nots is more dangerous than it sounds. It will be a world of thinks and think-nots."

https://www.paulgraham.com/writes.html