Why more machine guns add little to Courageous

Does a Courageous-class refit with fewer 4.7-inch guns, twenty-four 40 mm pom-poms, and more machine guns make sense?

The extra machine guns add little beside twenty-four pom-poms; 20 mm Oerlikons are more useful, and removing four 4.7-inch guns is hard to justify.

The proposed Courageous-class refit concentrates heavily on close-range air defence. Twenty-four 40 mm pom-poms already provide a substantial short-range battery, so additional machine guns contribute little. Twenty-millimetre Oerlikons would be more useful in their place. Removing four 4.7-inch guns is also questionable, since an anti-aircraft refit must balance overlapping weapons rather than simply add more barrels.