If people exclude me from a fireteam because I'm not using my ghorn, then they lost a good player. I never use my ghorn, even during solar burn. Why when I can use vex mythoclast or voc? My reasoning is because the boss' aren't difficult to fight, it's the enemies that spawn with it that make it difficult. Hence a strong primary or secondary is better overall, for me. Plus an extended mag high impact lmg is quite the effective weapon. If it takes an extra minute to kill the boss, so be it.