I was already assuming a perfectly idealized p2p network that had no overhead or sub-linear scaling. I've done as much to explore the space of efficiency gains in this kind of system as any two other people combined here, come on. Please don't try to play off that I don't know how the system works.
What I mean is that your perfectly idealized p2p network is still wrong.
A more detained explaination is forthcoming.
Decentralization has inherent costs. You're not saying anything to escape that.
That's exactly true, and I'm not trying to escape it.
Everything that
any network does has inherent costs, and every one of them in existence of which I am aware either fails to recognize this fact or else does so and does the wrong thing in response.