I loved that feature in D3, I could always go and listen every audio log, every piece of information about Sanctuary, classes, monsters, people, letters, archives, etc… I collected from the beginning.
Sometimes you are busy killing mobs and don`t listen to what that letter/book/archive tells you, I’ve been looking for that to listen it again but to my surprise it does’t exist in D4.
One day playing D3 I decided to listen everything I had collected by then, and thanks to that, I could understand many things about diablo characters, places and lore in general. Imo, it was a great tool in D3 and should be in D4.