That's one reason I think Urbit's implementation is cool. The network hierarchy is explicit, but the minimum required in order to to have the maximum decentrali

That's one reason I think Urbit's implementation is cool. The network hierarchy is explicit, but the minimum required in order to to have the maximum decentralization possible that can actually work (automatic lookup of p2p ids, ability to update the network/smart contracts, ability for other nodes to fork if it was necessary, etc.).