nomadic identity...
Relax. There are people working on this - myself included. The way it works in zot6 and nomad won't work for ActivityPub and the way identity provenance works in JSON-LD and other W3C initiatives has been evolving as well (dramatically), so this has taken a bit longer than anticipated. There are a number of ways forward. We will probably see some basic implementations this year. Content sync will take a fair bit longer, but if you recall - it also took a few years to sort that out in Hubzilla and streams. So the early efforts will likely be limited to profiles and connections. Still - it's coming.