In Rick McKinney's The Simple Art of Winning, in the section on aiming, he contrasts aiming with a bow to aiming with a pistol.
All top level archers focus on the target and let their aperature or pin line itself up. McKinney claims that when aiming with a pistol, shooters focus most of their attention on the sights and less on the target.
Is McKinney erroneous, or otherwise, why to gun shooters focus on the sights moreso that the target? What's different?