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.
The fiction publishing world is cutthroat competitive. Trying to use nonstandard tools / “breaking the mold” adds even more friction to success.