I'm converging towards the idea that, besides our phones, we need "sovereign units". This units would host all of what we want to have sole control of online: a blog, account and communication property trough a self hosted Nostr relay, a node to process transactions, mail+cloud, etc. That would be sole control over the information we want to share (through a blog), our social media, our private communication, and our finances. All hosted by a private "sovereign unit" that we can leave online 24/7 in a safe place (and more units in other places when viable) and access via the phone and our pc from anywhere. We might use centralized services for performance but we will always have the backup of fully owning and being able to access our own data, communication and finances, from anywhere.

I'm increasingly interested in such an application (even for commercial purposes, like selling phones) but I don't see it implemented yet. Is there something I'm missing?

I can develop such a device myself, but I want a reality check from the community first!