Who hasn't forgotten to check if they have something? Who hasn't been near the market by chance and decided to pickup something and didn't do a full list before hand?

It is something that can be useful, adds a pretty small amount of cost to an appliance like that, and doesn't get in the way of someone that doesn't want to use the feature.

It's a fantastic IoT opportunity, because if it breaks or doesn't work, the fridge still works fine without it.