I find Markdown most natural for writing because I do not have to worry about formatting or syntax.
Currently I deliver ~2 PDF reports per week using Ulysses or MacDown for content creation (distraction-free writing), and then typesetting everything into InDesign.
Thank you for creating this tool, I will try it next week.
The ability to render Markdown to Pug as an "Import Markdown" feature would be key for many people to adopt this.