My ideal mobile PKM would be Drafts, with a new face, previews, actions and workspaces branded for Obsidian. I think y’all might collaborate with agiletortoise, and wind up with a mature, high powered mobile app real fast. He has been dealing with issues like iPhone configuration for years. (I use Drafts on Mac and IPad, not iPhone.) And I can’t imagine Greg being uninterested. A markdown editor with enormous number of scripted actions, connecting with most anything, Drafts can be very complex. Limited to Obsidian use, it could be much simpler, but still offer easy extensibility.
Note that Drafts is now freemium: free for most, but 29/year for high end features. But given what promises to be land office business for a mobile Obsidian, I’m sure arrangements would be easy.
Of course, a similar option exists for lots of editors. My argument for Drafts is that it is very mature, v25 or so, and was designed as a markdown editor for capturing and doing things with text—sending text to other apps, previewing different flavors of markdown, and so on. So close already to what Obsidian needs, Obsidian/Drafts could be configured very quickly by agiletortoise. Adding and modifying existing actions and so on must be quicker than developing new.