When you turn in Bounties, you currently only get generic XP for yourself that's used for the Season Pass as well as the Artifact. I feel like if each Bounty also granted Faction XP based off where you got it (Vanguard, Gunsmith, Crucible, Gambit, etc.) it would help a ton of players out since it would help reduce the amount of Grinding that needs to be done since not everyone can play all the time for hours on end. This was already a thing in Destiny 1 and has always baffled me as to why it never returned. It doesn't even need to be that much XP per Bounty, just enough to feel like it helps out a bit.
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Bounties used to give Rep for who you got them from, until Bungo decided "nah, make the grind longer'