Have you heard of [syncthing](https://syncthing.net/) ? It syncs a folder between devices, like Dropbox, without the need for someone else's computer. No cloud, it's just your pc talking to your phone, directly and automatically, through your home WiFi.
This is a vision I could get behind, and I already do a ton of self-hosting for that stuff! The theoretical simplification, easier conceptual understanding, and easier portability would all be very nice plusses over what we have now.
Buy it does feel a bit to me like creating just one more perfect standard, and then we will have our fracultured world, but with 14 standards…