How can I generate a private key, though? (EDIT: Never mind, you just type a passphrase when you send an email. You can send me messages at hi+3mrw9gpkAN1Uc5ZUFxdNtxQhUiEvsWE1GveBkzNKYvqF@stavros.io)

I can see this having problems with revocation and password changes, unfortunately. Namely, if your passphrase is compromised, you're screwed.