I agree with all of this, but I'd add: 5. Visibility A physical library can be browsed, including by a visitor, and serve a useful social purpose. I often fi

I agree with all of this, but I'd add: 5. Visibility A physical library can be browsed, including by a visitor, and serve a useful social purpose. I often find it interesting to see what books someone has on their shelves, and it can lead to interesting discussions. I can't recall a time when I've discussed the contents of a Kindle library with someone.