Why Birmingham's bow was not repeated

Why was HMS Birmingham's bow form not repeated on later Town-class ships?

It improved speed efficiency, but the conventional knuckled bow was steadier for gunnery and later designers found more useful gains by changing the stern.

HMS Birmingham's unusual bow made her hull more efficient through the water. The rest of the class retained the knuckled form because it produced a somewhat more stable platform for gunnery. Designers also found that stern refinements offered a better route to later performance gains than repeating Birmingham's bow. The answer illustrates a recurring warship tradeoff: the shape that maximises speed is not automatically the shape that best supports accurate weapons use.