It's still not as efficient as having it on the front of the box. I will hold to that. Restaurants have books with nutrition info, too, for what its worth. I don't think they are included in this though, for obvious reasons.
So? Having a government employee come to your house and provide you with your healthy meals would be even more efficient than that. When did this become the role of the FDA or any government agency, to make sure private companies are making your life efficient?
If people want this then let companies voluntarily do this. If the demand is there, they will. If it isn't, they won't.