If I am not wrong, "Inbox" features is kinda something to do with upcoming social networking features of WordPress (inconjunction with BBPress) or even a built-in contact form (which I think is quite impossible).
And you forget the "Media Box" on the new/edit post page which I presume will enable user to see what images or media they use in a post.
Well, some people like me just don't like our devices to be enclosed with cases or holders. We think that they spoil the natural beauty of the devices. :D