I too use markdown + git for everything. I checked out Obsidian one day, it appears to be a wiki with tags to me, while it's great to do notes taking for some, it seems to be less organized for myself, and it's hard to use it for books, which is more streamlined by chapters etc, am I missing something?
Obsidian is an extremely extensible and customizable software. Truthfully, there is no text editor as customizable as Emacs, but if you're looking for something other than that, Obsidian is pretty close to being "Emacs for Markdown". I use Emacs for coding but I'm not a fan of the orgmode so I use Obsidian for note taking, and writing things.
You're missing something. Obsidian is amazing for writing and research because of all of the automatic linking between things. If you're already using markdown and git for writing, then Obsidian is worth another look because you can pick and choose to enable what options help your workflow.
As an example, let's say you tagged every time a character is mentioned (will be done automatically as well with 'untagged references' for proper names). Or you have all of your backstory and timelines in sections that are linked to your writing, but you can output the finished writing without all of those links in there. So as an author you get a full timeline with metadata. You can also use additional tools for research with Obsidian plugins, including Zotero for academic references, Markdownload Browser Extension for shooting MD and images straight into your vault, git plugins inside Obsidian, etc.
Sorry I'm rambling, but absolutely go look at it again!
