Are they just peasants that waste a raid spot?
No other launcher offers such offensive firepower, to bring anything else vs the mighty Crota is just an insult.
EDIT: No one said anything about NEEDING a gjallarhorn for ANY ENCOUNTER.
Only that it's offensive prowess is second to none, and to use anything else means you are most probably a g-hornless peasant.
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I used my HoC and we got by just fine. Even after getting Gally I still run sword. We get the job done regardless.