Not just Obsidian. I use the same directory of MD files for Obsidian, Zettlr and Typora. I've even configured the first 2 to auto-name new notes using the same custom date/time-based pattern. You can then use Jekyll (the GitHub pages engine) to publish/update specifically tagged/located notes to your blog or use PanDoc to convert them into an ePub for reading on a handheld device. Needless to say you can also use whatever a tool or programming language to do batch operations on the texts.

And by the way the Obsidian has just released an [optional to use] mobile app which makes keeping notes in it even more useful.