Green Mace is a little late for me. To my mind there's roughly a 15 year window between 1950 when the Korean War starts/the UK still needs to show the flag and 1965 when nuclear armed Buccaneers are operational/decolonisation is well underway where cruisers make sense with what they knew at the time.
What made me consider the Des Moines-class was the idea of the Royal Navy scrapping more of the uncommissioned ships post-war. Still wanting cruisers they start designing brand new ones incorporating various improvement – high pressure/temperature boilers, improved crew accommodation, air conditioning, excess electricity generation capability, top weight capacity, modern bridge and CIC etc. – and decide to modify a system that already works in service to avoid prolonged development.