The inherent flaw is Qualcomm actually having to properly support one of their chipsets directly to customers for once, something they’re apparently really bad at. This box has had some pretty bad press already, mostly due to the software being abysmal.
FS 2020 reportedly already used 2 PB of data as it’s base. Good luck downloading that!
Object storage (the S3 API stuff) is the most logical answer here, it’s much simpler and thus more reliable than solutions like Gluster, and the abstraction actually matches your use case. Otherwise something like an NFS share from a central fileserver works too.
But I agree with the other comment that you’re trying to do kubernetes on hard mode and most likely with a worse result.
If this means I can deny WhatsApp access to my regular contacts and still have a decent user experience I’m all for it.