Not a official steemit Voice, however following discussion online. Let's assume a hacker gains access to your account. First thought would be to steal your funds however with SP & Savings accounts, it will take time to execute. It is very likely that Hackers will personally attack accounts, by Posting & Commenting. Once you gain back access to your account, at least you can re-edit any unwanted changes caused by a Security Breach or Personal Reason.
With third-party services like SteemConnet or Busy.org, your Steemit Account is more likely to get breach in the future