I'm inclined to think abouth the design as IJN's "super-Omahas", ie recce cruisers to work with the battle line
- a few planes for long range work in good weather,
- very fast
- high density of fire on front and aft bearings but limited ammo
- sloped front and aft bulkheads - might actually provide decent protection against 6'' shells.
So a different purpose than US CL/CVs projects from 1930s