You could also record all of your phone conversations and copy all of your off-the-record gchats into text documents, couldn't you? The point isn't for this to

You could also record all of your phone conversations and copy all of your off-the-record gchats into text documents, couldn't you? The point isn't for this to be absolutely foolproof, but rather that when you have a somewhat sensitive conversation with someone you trust, you can have some peace of mind that there won't be a hard record of what you are saying.