For the specific purposes of redaction, it's not about whether something "needs" to be classified. They redact what is classified. The decision to unclassify lies elsewhere.
And the reason it hasn't all be declassified with a blanket order is no doubt simple bureaucratic conservatism. No one is going to get an award for "brilliant work in declassification", and the last thing any spook wants for her career is to be yelled at for declassifying something embarrassing.
And the reason it hasn't all be declassified with a blanket order is no doubt simple bureaucratic conservatism. No one is going to get an award for "brilliant work in declassification", and the last thing any spook wants for her career is to be yelled at for declassifying something embarrassing.