F-4e/aim-4d

Question for you guys. With the noted lack of appreciation for the AIM-4D’s performance on the F-4D in Vietnam, particularly by Colonel Robin Olds, why was it still in use in 1972? The Phantom book by Airtime shows a Bitburg F-4E (they didn’t arrive until 1972) taking off with four AIM-4Ds. For one, if the -4D wasn’t good enough for the -4D 😀 , why was it kept in use on the newer variants of the Phantom? Could it be that the Sidewinder stocks were being directed to the Vietnam theater? The USAF museum site has an image of an F-4E prototype displayed with its weapon options, and the AIM-4D is there, so it was clearly meant to arm this variant of the Phantom as well. But why, if it was unfit for use against small, maneuvering targets (a role for which it was never intended in the first place anyway), was it still used 5 years after Robin Olds had his Phantoms re-wired for AIM-9s?

Any discussion would be appreciated.