What I meant is this: I do have a paperless workflow and used to have thousands of Evernote notes with meeting minutes, scans of paper, etc. Whilst this is working pretty well for now on the Desktop and Mobile, there will be a time in 10-40 years when I need to go back to some of those documents. And whilst I wish Evernote all the best of luck, chances are good that they won't be around or worse.
Whilst you are correct in 'as long as binary is documented' it's platform agnostic, you are also completely wrong. Have you tried to read some documents from just 15 years ago recently? Apart from reading from floppy disks, it's just hard.
The internal semantics of org-mode are important to me now, when I do my actual project. In the far future, the only thing that is important is that I can full-text search and find my old legal documents. That's just a billion times more easy and realistic with a flat text file than with a hypothetical well-documented binary format.