Adding on to this, I'd love to see the return of "lore props" scattered in the dungeons, like the folios you find in Tam-Tara Deepcroft (Hard). Sure, it's impossible to look at them with a standard party, but it's really fun to go through unsynced/undermanned just to look at them. It's a great way to build the story world without having to sit through a cutscene. (Like the "Love Letter' in the Great Gubal Library (Hard) that raises far more questions than it answers.) They seem to have stopped adding those after Heavensward, likely because no one was stopping to look at them.