Let's look at it from another angle and pretend cocoon is the best perk in the game. No amount of cocoon is going to make the hand cannon, auto rifle, shotgun, fusion rifle, or rocket launcher even remotely good. They are just really bad weapons from their stats to perks (even if we assumed cocoon is a top tier perk). The problem is cocoon's benefit greatly varies depending on the weapon. On the Machine Gun, I 100% agree which is why it's by far the best gun from the raid.