Hi,
I think a great QoL change made later in WoW's life was having quest interactables not despawn, just disabled for that player once they had the quest/item.
I am thinking of quest objectives like 'Find so-and-sos book', and when you get there you see 5 other people waiting around for the book to spawn. In newer versions of the game, anyone that has the quest can interact with the book to grab it. I don't see any fun in standing around waiting for these objects to respawn, so I think a change like this could provide a much better player experience without altering the purity of the vanilla/blizzlike experience.