Commonmark (https://commonmark.org) exists, has a fairly well defined standard, and the reference implementations are not hard to reason about. They are part of several thousands of larger codebases right now, too.

Org-mode on the other hand is basically an emacs thing that has never been seen in the wild outside maybe as a pandoc input? Which is coincidentally another tool I almost never actually use by itself. And I have literally no idea how ota reference implementation works or on which languages could I embed it and how.

I'm pretty sure my experience isn't that rare too.