Previously they still had the on-deck shooter preloading the shotgun, so that shooter wasn't available to reset the stage. So instead of pre-loading the shotgun only, you'd preload the other guns as well. It was definitely a win-win situation. My squad only had 9 shooters on it and we still moved through stages very quickly. I never felt like we didn't have enough people available to reset - but everyone on my squad worked hard.