Why are we arguing whether the longbow could penetrate plate armour or not becouse the main target of the longbowmen was the horses not the men.I havent seen anywhere any evedence that the armour of the horses could have stopped the bodkin arrows.If in a classic charge you are able to shoot down lots of horses or wound them,which might have even worse results to the attackers it will disrupt the charge,like in Agincourt where the main body of the attacking army was in very tight formation in a muddy ground.Also we have to remember that the other part of the English tactic was that their knights fought on foot protecting the archers.So if the enemy knights are bogged down with arrow fire and are too heavy to attack on foot.The French man at arms had to attack against the English Knights who were superior to the French men at arms.So English beated the French becouse of the same thing that many other Knight armies lost.All the French had to do in Agincourt to win the English was not to charge,but starve them out.
The ill dicipline of the French armies combined to new tactics of the English cost lots of blood to the french in the early part of the hundred years war.