Can 40 mm accuracy offset a 20 mm rate of fire?

Has 40 mm targeting improved enough to offset the higher rate of fire of 20 mm close-in systems?

It is close and may already have reached that point, though no detailed comparison is given here.

Modern 40 mm targeting is judged close to offsetting the higher rate of fire associated with 20 mm close-in systems. It may already have reached that point, although the passage gives no performance figures or system-by-system comparison. The useful distinction is between firing more rounds and placing larger rounds accurately.