[dduncan]

I think this is only true if (a) Your local computer is part of an existing secure, cloud-based personal solution for sharing generic files, and (b) You have note-taking capabilities to work on a common note-taking file format across the devices in (a).

I think you suggest a point, though, that it seems that it would be ideal to have a general secure and accessible file storage implementation, with specific apps where needed.

And personally, along the lines of what you're saying, I'm actually more concerned about finding a really good, local note-taking method than even involving the cloud or de-centralized Internet in some way.