It's an ambitious project because ultimately you need to coerce all the apps with valuable data to export to or be compatible with upspin to realize the dream, so to speak.
However right now I've already found it useful for storing my personal files and media and I've enjoyed reading the codebase.
Not sure if Apple is having some heavy hands in this but I think 4.9G and 5G will fix this within next 10 years. While it is still a little too early to tell, it does have the potential to be used as the sole connection in many areas.
have you been reading my ssb log[0][1]? or lurking in our matrix room[2]? that's kind of exactly what the libre software project i contribute to is trying to build. we're a small team rn, but i think the direction we're going is pretty cool.
[0] https://viewer.scuttlebot.io/%256GAD8%2F8qQC26qFTgYvQZ3q97qY...
[1] https://git.heropunch.io/%251BtG8h6Oh6uI7kjnZkvK20wqLrCZlbbF...
[2] #heropunch:matrix.org
Would a NAS from Synology or QNAP offer what you're looking for?
But I do really really want to simplify my life in terms of identity and storage. I'd like to simply have the same view of data on all my devices, with probably my phone acting as a central source of truth in terms of identity and carrying around a hot cache of important data.
But I don't just mean using dropbox everywhere. That's really clunky to me. I want it to be better, but no one's really put it all together right yet.
I feel like plan9 was on to a lot of this stuff a long time ago but it fizzled out, an idea ahead of its time, with bits and pieces of its ideas taken out of context and rendered largely useless (please don't tell me linux does filesystem namespaces now, it's really not the same).