I’ve been looking at Craft Docs a little here and there. It’s Apple first, great experience on iOS and Mac, block based and supports backlinks, a nice little app.
They just announced ‘Craft Connect’ which is a bit ambiguous but seems to be looking to ensure data portability between applications. Obsidian is referenced in the launch materials.
Worth keeping an eye on.
Edit: Link here: https://www.craft.do/s/KbvqOMU1Ejpp6k