Their retirement was kind of a godsend to the Spruances (and maybe other ship classes). That fancily automated, reduced staffing engine room on the Spruances didn't hold up on its promise and the engineering departments were pretty undermanned. The Iowas freed up a bunch of Boiler Techs and such that let the Spruance staffing get beefed up with folks that could stand a watch and do general maintenance.