There are so many books, scrolls, notes, and letters in BG3, you don't always want to stop and read them in the moment, depending on what you're doing, so you end up stashing them.
It's hard to tell what you've already read and what you've yet to read.
It would be awesome if there was some little check mark, or indicator in the corner of the inventory icon to show which of these items have been read or not.
This would be especially useful for making sure you don't miss triggering any quest lines that rely on reading things to begin said quests.