I think it would be cool to have a Bestiary for the over world that fills out as you kill enemies in the over world. Listing their locations, drops, and anything else special about them. Maybe a little bit of lore or something. You could even expand it in the future to have tabs for fates, dungeons, raids; and would give something else for people to completionist over.
As for the Gathering Log. I think it would be really beneficial that once you discover where and when a mature node is located that the ??? for the item actually changes to tell you where and when it spawns now.