Shotguns need to have a drawback, an archetype limit to balance their instant and consistent lethality. Typically, not just in Destiny, they might have slow or very slow handling, wide pellet spread, and minimal range. With MB, Astral and Felwinters and the right perks you re overwriting all the drawbacks. That's why they're so overused. Nerfing into the ground is not desirable but getting on top this and not making things worse (Astral) and worse (Felwinters) most definitely is.