Joker's huge wall of nearly incoherent and jumbled text implies that archers are allowed to make more mistakes than infantry, but this couldn't be further from the truth. Archers are the most targeted and vulnerable class in the game, and a single opposing archer can disrupt an entire team of archers. Not to mention cavalry, especially heavy, who make the bulk of their kills in the form of speared archers. Archers generally have less armor, less iron flesh, and less powerstrike, meaning almost any mistake will result in death or near death. Archers have to stand still when they are releasing arrows; so any cavalry can charge an archer, whose only choice is to attempt to make a shot and either get lanced in the face or hit them and get bumped for half their HP
Also, archers can't just "attack all targets", the distance of the enemy, map terrain, and composition of the enemy team all have huge effects on the effectiveness of an archer. Archers are not some kind of godly race with eagle eyes and headshot accuracy.
Lastly, how is missing a shot not detrimental to an archer? He has a limited amount of bolts/arrows, and according to joker, since the archer is so versatile, we're assuming the archer in question is one with a 1 or 2 slot weapon, which makes bolts/arrows even scarcer.