Imagine going through all that effort, and then saving the output in Markdown. It's like finishing your astrophysics PhD and then getting a lobotomy. Just to repeat my years-long crusade of yelling at clouds, we need a cross platform, Rich Text HTML Document standard .
Isn't that "just" HTML? What should be added to HTML?
It's mostly about removing stuff from HTML - JavaScript, forms, and various CSS features - to make it focus on simple formatting. Then requiring the appropriate CSP security constraints to ensure privacy/security. Finally, standardizing on a way to include binary files (images, etc.) in the format using a JSON blob at the end of the text which can be referenced above.
Self contained, document focused, cross platform, secure and private, while still being standard HTML. Would replace ePub, .docx, Markdown, and provide a standard file format for Google Docs to export to.