I could see the choice been made in 1972 or so that instead of the proposed escort cruisers that Albion, Bulwark and Hermes be used in that role. It could be reasonably expected that with proper care they would last another 15 - 20 years. (we know Hermes has 30 good years in her with 10 difficult years after that, they don't)
IIUC there was argument that the Bulwark waa a better use of ~900 crew in the ASW role than Tiger and/or Blake, with better command facilities and able to carry a full helicopter squadron. This went to the extent that Bulwark was activated for a couple of years in the late 70s in the ASW role.