Back when I first saw them, they advertised benefits like telling you when you were out of stuff, when things were about to spoil, automatically ordering new stuff, doing that based on recipes, and so on. All through a touch screen in front of the fridge.
So, there's definitely some utility to it. I think most of it was and probably is the aspect of consumerism where people buy stuff to feel better than others and/or show off to them. It used to be how they look, what they contained, shelving, etc. Now, it's attributes like Internet-connected with whatever the software does.