This has no word export option (unless I missed it) which makes it infeasible for a lot of writers. Like it or not, docx is the format a lot of folks in mainstream publishing expect. Context: My partner is a published author and I've pitched stuff like this at her on multiple occasions as an alternative to Scrivener. In addition to her laughing at my insistence that markdown is a superior way to write, she cites the…
Just to add here, the question is not “is markdown (or tex or binary strings or...) better”, but “can the person who determines whether I get paid open the file?” The fiction publishing world is cutthroat competitive. Trying to use nonstandard tools / “breaking the mold” adds even more friction to success.
Primarily, all a writer does is write plain text. Probably less than 1% of sentences are anything other than plain text.
There's not a lot of headings or titles. There's not a lot of italics or bold text.
What else is there? What am I missing? What's the benefit?