I only use audio books for pleasure reading, so I don’t know if that counts as ‘anything important’. As for focusing on the actual book, I’ve got decent dual focus, but I tend to aggressively pause my books when distracted to minimize that, and the app has an auto-rewind feature so it can roll back a bit (I have 30s) after a pause to cover anything you may have missed. Listening to a book or a podcast while driving/doing chores/anything that doesn’t require much brain power is pretty normal for me.