+1 for asciidoc. All the arguments are already mentioned. Markdown is useful but very limited to small documents. But I also understand that Markdown is very much built in Oblivion making asciidoc alternative to a major extension and complex it for many users who do not work with asciidoc. Another way of integration would be a plugin that make it easy to convert a directory/selection/or-all-links-from-a-note and generate a snapshot asciidoc document with back-references (maybe again links into obsidian) and thus enable a to and fro approach. This could be very practical for the people starting on articles or books with a zettelkasten or similar approach.