A few years ago, I switched to a Markdown editor to simplify my writing workflow. And while I can't really recommend my personal approach to writing, there are now many excellent Markdown editors available, even for mainstream users.
So let's start with how and why I use Markdown. After publishing a few books ourselves, Rafael and I determined that we would need to work with some kind of online publisher when we moved forward to Windows 10 Field Guide. Our previous approach was too time-intensive, and Rafael, in particular, spent a lot of time handling customer service-type issues, especially related to billing.