In addition, it's also mandatory to use the email account used for the registration because the lost/hacked account can only restored to that email address.
Where you found this message ? If account hacked with email address and I am holding my private key then what happened? Sign message from unedited address or from staked address should enough for recover account in my opinion. How someone will send mail if account hacked with email address? I think it's very difficult. If this is true then theymos should consider some more options. Because account might be hacked with email address.
@OP why are you discouraging peoples to stake bitcoin address ? You should remember your email as well you have applied for recovery. Stake address is most helpful way to recover and unlocked account. You should make this kind of post.