So what if we could focus Prime Engrams, similarly to how we can focus Gambit, Iron Banner, (and soon) Crucible Engrams?
For example, Master Rahool or Banshee-44 could offer six random legendary weapons every week for Focused Decoding. You could focus a weapon engram as many times as you have Prime Engrams, Legendary Shards, and Glimmer (although knowing Bungie they would likely make it more expensive than Ritual Activities' Focused Decoding).
I think it would be a useful feature for all players, allowing players a consistent way to farm rolls for their favorite guns, it might also help declutter vaults so players don't feel pressured to hoard subpar weapon rolls, as well as make visiting the Cryptarch or Gunsmith a little more interesting.
Tell me what you think?