and, interestingly, even ADVENT/Alien troops benefit from the Headshot mechanic! (But only on standard shots, just like you)
Not even getting into the possibility of free reloads. In fact, if they don't need to move, they can kill twice their ammo in Lost, since reloading only eats one action simply kill until out of bullets, reload, and keep killing. Headshot means a lone soldier can potentially kill as many Lost as they have ammo without needing a special skill.