In terms of Dungeons and Raids, there is no reports after clears, only after fails. (Except for final report some bosses have a damage report) Since Bungie already uses the floating banners for information (ie. lost sectors, Call to Arms Daily Shipment etc), A post carnage report after each boss in said Raids and Dungeons would allow players to know how well builds are or how efficient they are during DPS. Have the list float near the exit of the encounter, or above final chest, for the team to see how they did. Im not sure of this has ever been posted or brought up, but throw an upvote this way if you think this would be a good thing to have.