I have heavily used both Markdown and Org mode. And I have grown to prefer Org mode over the other because of better (subjective, of course) syntax, etc.
Org mode is supported by Pandoc and even the rendered on GitHub/Gitlab.
[If this is possible, I would write manuals and wikis for my repos directly in Org mode.]
Is this something you would consider supporting?
There isn't one that I know of that would 100% support the Org mode spec. Coincidentally, a discussion is going on here.
If using static binaries is an option, Pandoc provides those. But I understand that that wouldn't be efficient.
I would prefer a pure Python implementation. If you spent some time working on making that a reality, I would add org mode support to man.sr.ht.