I also started on this journey of finding that perfect markdown editor and ended up with Notion. Obviously markdown editor search will hardly bring notion in result set because its much more than that. But you can use it as markdown editor. It also takes a while to get used to. My biggest problem was I totally forgot I was looking for a markdown editor and just got lost in trying all the goodies of Notion. Again that's me and one may still don't like it as an editor.
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