So, we got glaives during Witch Queen, right? And the hive used swords, cleavers.
What if we got some sort of first person Primary melee weapon? It's a crazy idea that probably won't happen, but something unique to destiny 2, just like the glaive. I'm just not sure what form that would take. We have the glaive for medium to close range engagement, the sword for up close, so it would make sense to follow up with a long range melee weapon in the primary slot. Something from the darkness, more likely, I don't know. Just a random thought.