You mean they don't totally dominate the field?
FYI, I've heard that what made Agincourt happen was not accuracy of aim. It was range and rate of fire. Consider: estimates are that the English had about 5000 archers. At 8 shots per minute (trained archers were supposed to be able to do 12, and top ones over 30), that is 40,000 arrows per minute. About 10,000 enemy soldiers were killed, and I've seen sources say that the battle was decided in the first half-hour. That would be 120 arrows per person killed, and not all of them died by the bow.
With those numbers, what matters is not having every arrow hit where you were aiming, it is having so many arrows landing that the general target area is "an unsafe place to be".
Cheers,
Ben