the problem is that gjallahorn does everything better than it, and you have grenades called solar grenades and pulse grenades that work just as good, pulse grenades works amazing as it has increased length, i've cleared a lot of CE raids with my raid team, we've tried lots of setups and realised that dragons breath is not as good a a gjallahorn or hunger of crota for clearing out enemies and we always have a variety of characters so theres atleast 1 warlock and titan for the grenades, even a gjallahorn seems useless until hallway as icebreaker can clear out a shit ton of enemies in 1 shot at the light pillar part and it has increased agility perk. hunger of crota > Dragons breath, does more damage and has tracking, can also kill shriekers in 1 shot on normal while you have to wait 10 seconds for dragons breath to destroy it. overall dragons breath is more of a cheesers weapon and a weapon you would just use to have some fun. it's only good if you don''t have a gjallahorn, hunger of crota or hezen vengence, if it has tracking maybe it will be on par or just below hunger of crota.