The problem with markdown is that if you want to convert it to a formatted set of pages, the output will differ based on the version of your markdown converter.

The problem with markdown is that if you want to convert it to a formatted set of pages, the output will differ based on the version of your markdown converter. Similarly for HTML and also for plaintext to an extent. A PDF should remain exactly the same forever, but AFAIK the only properly editable document type that really keeps exactly the same formatting over time with updated software releases is TeX/LaTeX. In fact, that is a guarantee - if a LaTeX version doesn't produce exactly the same layout as a previous version for the same input document, it's officially a bug.