Yes I think it's fair to say it's a programmable system, because it can be extended significantly by either packages or your own local lisp setup. I think org-

Yes I think it's fair to say it's a programmable system, because it can be extended significantly by either packages or your own local lisp setup. I think org-mode could easily be used to maintain a collection of notes, whether in one large file or multiple small ones. (That's an obvious example of how no workflow is mandated - people make different choices on that, and use org-refile to move things between files too.) I've seen android "viewers", but since they require having the file(s) on your PC and your phone they get a bit horrid - using dropbox to sync, or similar. For that reason I've never used them.