A lot of truth in your post.
The policy gives the FBI control over what is remembered and how it is remembered. It is an extremely powerful tool that puts most of the cards in the FBI's pockets.
But if the new agency will be just as bad, there is no reason to change, is there?
How about we require the FBI to record interviews, maybe wear body cameras?
How about courts disallow 302 statements as hearsay, and only accept recorded interviews?