Let's not forget that the three Courageous class carriers were successful ships given the limitations inherent with being conversions. Furious fought a good WWII and I don't doubt that but for bad luck and sheer stupidity resulting in their loss Glorious and Courageous would have done just as well. At the time of her retirement Furious was operating just as up to date aircraft as her brand new replacements, just as well, and the seas off Norway are not the easiest to operate in. Courageous and Glorious being slightly larger with slightly larger elevators would have had even less difficulty with such aircraft.