I think for a vast majority of people it's a solution in a search of a problem. Grocery shopping is an uncomplicated matter and the pen and paper list covers th

I think for a vast majority of people it's a solution in a search of a problem. Grocery shopping is an uncomplicated matter and the pen and paper list covers the need for a memory aid in those (rare) cases when it is needed. It is also much easier to operate as it can be kept in the shopping cart in front of the eyes at all times, it is easier to glance over and it is easier to strike items off the list (by tearing through them). All in all, the paper list is better than the app on a device. Don't get your nerdiness blur your perception of reality of common folks :)