what, recommending just one more format to learn? I don't think that's what the parent post is looking for : )

Asciidoc/Asciidoctor is non-ambiguous (unlike Markdown), works with different workflows and unlike org mode you can use different editors, easy to learn (unlike LaTeX). ReStructured text is the second closest but there you have to have Python in order for it to be useful, so Asciidoc is the only one plausible universal text markup as I see it.

I couldn't have said it better.