Some of these if not all have been mentioned. Not trying to take full credit just want some changes for End Game players like myself.
SOCIAL - DPS or score counter for strikes and raids. Tower mini-games. Sparrow Racing. Grimoire location ingame. Increase glimmer cap. Doesn't need to be infinite but higher than 25k.
GUNSMITH - Buy and sell weapon parts. Re-roll legendary weapons for Motes of Light/Commendations. Offer bounties or side quests. Weapon crafting with weapon parts. Sell weapon Telemtries.
Eva Levante - Buy and sell class materials. Re-roll legendary armor for Motes of Light/Commendations. Offer bounties or side quests. Offer "Barbershop" once a week for 10,000 glimmer to edit characters hair and facial features. Crafting with class mats.
Vangaurd and Crucible Quartermaster - Buy world mats for rep and glimmer. Offer bounties or side quests. Buy commendations for rep/marks/mats and glimmer.
Shipwright - Buy ship schematics and ships and sparrows since breaking down rewards nothing. Sell legendary ships and sparrows.
Factions - Buy world mats for rep and glimmer. Offer side quests.
NPC quests while patrolling.
Exotic bounties relocated to "missions"
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Can't hold me down bump