Idea for a neat product from Automattic or really anyone: Configure WordPress for writing a book, hook it up to an AI service that can always turn that site into prose, reorganized into chapters, however you'd like, on demand, in an instant. You could use an outliner to arrange the table of contents and it could automatically generate a back of the book index. Technologically I think today's AI is ready to do this, just needs to be packaged. Charge a fair price for the service, esp at the beginning it would totally be worth it. Who knows where it would lead. I bet a lot of writers would use it, I certainly would.