I had a long, lovely chat with doctor and YouTuber Ali Abdaal last year, and one of the things he said that blew my mind was how five years ago reading Show Your Work! finally got him to start sharing stuff online. He now has 1.4 million subscribers on YouTube, and has quit his job as a doctor to do it full-time. In this recent video, he talks more about how writing online changed his life.
Personally, this is my favorite thing about showing my work: learning from people who have learned from me. When you share, you learn.