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> 4. You cannot efficiently have shared states in pure p2p without an identity server. That would require the clients to bring their keys with them on every device, not very practical.

Not sure I understood it correctly, but don't they want to solve this with a blockchain?

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Exactly what I mean. Either you have a central server, or you use some kind of distributed store among the peers, but then every client needs to bring his private key on every device. You cannot check your messages on a friend's computer, on your tablet or whatever.

No, you could also store the private key encrypted with the users password in the blockchain. The only difference to a central server is that you lose the ability to regain access to your account if you lose your pw.

For something that would aim to be used by the general public, that's a huge problem.

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