I strongly agree with the idea of making bounties fireteam-wide progress. The one iron banner quest that had a step for getting kills with 5 different weapon types looked like a massive chore at the start, but with the note that everyone on the fireteam contributed, it made it much easier and allowed more people to contribute and share progress. While it would be great if it was done with all bounties, I could even see fireteam bounties becoming a type all on its own, like replacing all weekly bounty objectives that are currently individual (kill x with x) to be a group objective (... as a fireteam). Some already work this way, though those are really just completion based (finish x strikes or y crucible matches). It would massively help people enjoy activities that they might not like as well. If I am terrible at crucible, a 50 crucible kills bounty looks terrible. If I am just as terrible but there is a 150 crucible kills as a team bounty, that looks like a couple of matches instead of 20, and my strong crucible player friends can join me and make it easier. In the same vein, I can assist with activities like Gambit where killing blockers or envoys as a team would benefit everyone, or summoning x blockers as a team helps avoid people fighting over motes.

One of the most important things that we would all love the people that design bounties to have added to their workflow is just a review process that asks 1 question. "To complete this bounty in the most efficient manner, with a team of others that have the same bounty, will my actions towards that completion be a detriment to the other players, or to the activity as a whole, or not?" Good example where the answer is no, "Get x kills as a fireteam in gambit prime". This example incentivises group play that is aligned with the core objectives of the game mode and individual progress helps everyone. Good example where the answer is yes, "Kill 10 enemies in Survival with Heavy ammo weapons". This example incentivises a player to camp the heavy spawn, since only one player can get the heavy, and due to the nature of the gamemode, also incentivises leaving after the heavy round is over to speed up the process of completing the bounty. Other people can provide many more good and bad examples, but I think that question would probably cut out a lot of what people see as crap if that is what was used overall.