Not sure if this has been brought up before but, an idea is to have quest progression available through the actual quest screen. Upon completing a quest, it can sometimes be a nuisance to have to travel back to the Tower or Reef in order to progress through it. For example, the Crucible quest line. Instead of having to go back to talk to Lord Shaxx every time, there should be progression through completing the quest and accepting the next portion of it, that way we wouldn't have to go back and forth as much.