Well he is right, believe it or not the French did boast significant improvements to the gun around the era when the Musketeer ranks were around. Even so however, muskets were still inefficient in combat proving to take too much time to reload when the enemy is closing distance quickly. Hence where the sword comes in (and the Bayonet's on rifles if you'd like another perspective) so they weren't completely defenseless when they can't load their gun.
