Destiny needs a quality of life update. Badly. Top things I'd personally like to see:
1. All the Warlock glitches/bugs fixed. There are a lot.
2. Warlock melee speed addressed.
3. Farmable, weapon specific Gambit Prime Bounties.
4. Make all universal ornaments available for all Armor 2.0 pieces.
5. Ascendant Shards and Prisms from Valor and Infamy max ranks and resets.
6. More pinnacle drop sources (Maybe a weekly featured raid that rotates? Pinnacles from all dungeons.)
7. Vendor updates.
8. Better protection from duplicate pinnacle drops.
9. Reset on world drops. If we add more weapons to the loot pool, some need to go. Maybe tie tangled web armor and some of the other armor sets to a Spider destination engram.
10. An in-game LFG system. No app. Your casual player isn't going to go the the app every time he wants to try something new.
11. Number of crucible tokens gained after a match increased significantly. In fact, more rewards and incentive for PvP in general.
12. Choice between a weapon and a piece of armor from vendor rank up.
The list probably goes on. Those 12 are just the top items that would affect the replayability of both PvE and PvP.
Edit (Notable additions from replies. There are more below. I don't want to add every single one. Post will get too long.):
13. Bounties from orbit
14. Y1 Nightfall weapons brought up to year 2 with random rolls. Get rid of the 3 nightfall playlist and just add all weapons to strikes as strike specific loot.
15. Console performance improvements.
16. Black screens in PvP.
17. More sources for Eververse loot. Either make more sources for bright dust, or tie the loot to triumphs or activities.
18. More vault and inventory space.
19. More sensitivity options for controllers.
20. Ability to set quantity when deleting items.
21. Advanced tooltips for weapon and armor stats and similar things that give us accurate numbers of how much dmg increase one stack of rampage is for example.
22. Optional "apply to all items" button when previewing a shader.
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23. the re-establishment core campaign missions 24. add a yes or no tab to all quest ( if you click yes it continues as normal if you click no then it’s automatically deleted so players have real choice ) 25. Updating xur loot table to eight items ... four item that can be bought for legendary shards and four items that can be bought using silver ( this is to cover items that are only available through quest or raids to those out there that don’t have the time or the patience to do these activities ) 26. Updates for open world/patrol for new gear 27. Returning prime engrams back to what they were before the recent changes for pve content only 28. A management shake up at bungie to get rid of the idiots that keep trying to sabotage this game by introducing garbage