GET RID OF ENHANCEMENT CORES!
On topic
1. Be a little bit more like an RPG, although i think having multiple vendors at the tower is great and i think bungie did and excellent job of this. It would be nice to be able to have activities to do at the tower or hub, be a bit more interactive. We need something to do there, card game, club etc. Just something to make being at the tower fun.
2. They need more Raids, especially at the base game, 3 full blown raids, with like 2-3 raid lairs. Worlds need to be bigger as well.
3. They can't have content drops like Curse of Osiris or Dark below, or even Warmind for that matter. Like those releases need to bigger drops and have more content if there going to cost 20-30$. Because to be honest COO, DB, and warmind could of been free content , i don't think there was anything substanstial in either of those 3 that warrant the cost.
4. Bring back sparrow racing.
5. (Impossible request) fly ships
6. make the skill tree for class and sub classes better
7. Better customization for character.
8. make the dungeons in destiny more intricate.
9. Have a library at the tower, where you can take the information that you find out in the world there. Learn about the lore there at the library get hints in-game on how to full fill a task or even learn a ability from what you read. Or how to find a weapon or item that will be of use in a quest your on.
10. Matching making in Nightfall , honestly no point why it isn't there.
11. make the grind less like a chore, and a more rewarding task. Destiny shouldn't feel like a 2nd job where theirs no payoff.