Use whatever gets you the win. If not shotguns, that's fine. But in IB if you don't use shotguns because of principle and you cause your team to lose, that's not good either. If you don't use shotguns but rather something else and produce results, then go for it. Like I said, I couldn't care less about crucible. But in IB I'd want to be on a team where each team player is using whatever they do best with, principles aside