One thing the documentry showed that the campaign showed was that reliance on missiles is a poor idea the T42 were fitted with phalanx post war and T22/III have a good combination of systems including goalkeeper. But come T23 on its Seawolf and 2x 30mm. And What apart from aster and 30mm will T45 have.
There is still a place for Guns in the airdefence umberella.