So the Dokuwiki Markdown Plugin does not accept Markdown .md files?
I looked further into Dokuwiki’s support for markdown. The plugin from 2012 that I mentioned before which allows .md files isn’t a good solution - it requires markdown universally, breaking the [[internal link syntax]] that Dokuwiki and Obsidian share; it also requires .md files to also have a .txt suffix - which means that using it would still not allow interoperability.
I’ve made the parallel request over in Dokuwiki’s forums, but given the other comments on this thread in the last two weeks, this still feels like a “plays nice with others” option that could really support the format-independence priority of Obsidian.