[muyuu]

Yes, that's fine. But the rest of the elements are non-trivial and you left them "as an exercise for the reader". This usually means that the reader will just run the standard client with a full internet connection and get hacked to high hell.

You can have a computer with a firewall and a custom protocol connected to another system, and still get hacked, if you don't put in place the sort of measures Armory uses.

Read carefully what you quoted: "it relies on on the Satoshi client to securely connect * to peers, validate blockchain data, and broadcast transactions * for us" - that is not the actual problem when you have your server rooted. The problem is KEYS. Key generation, and key storage/management. Which no other common solutions that I know do in a way that won't get your arse robbed if the computer storing the wallet is compromised. Which I think is a big deal.