Why the Courageous class did not improve on Renown

In what ways was the Courageous class supposed to improve on Renown?

Apart from a claimed shallow-water capability, the Courageous design offered no meaningful improvement over the Renowns.

The premise that the Courageous class materially improved on Renown is rejected. Its claimed ability to work in shallow water is treated as the only plausible advantage. Even that appears more like a justification for the design than a decisive operational gain. In fighting value and overall balance, Courageous and her sisters offered no improvement over the Renowns.