Not the person you asked but I can answer that from my perspective:

I am always on the lookout to automatate as much boring, everyday tasks. A Smart Fridge like that would allow you to generate shopping lists and reduce food waste by alerting you to possible soon-to-be-spoiled food.

A bit like what roombas are doing for cleaning. You still need to do it yourself a bit, but they help.

Not necessary, not even a gamechanger but another neat home automation. Would be nice, sad to hear they don't work well.

That does nothing to solve my real problem, which is too little surveillance.

I always just want to know how much of X or Y is on hand when I’m physically out and at the grocer. You can just buy another but that usually leads to folks storing 5 bottles of ketchup or whatever

Because you are at the supermarket trying to remember what you have at home.

...while I'm at the grocery store on my way home from work?

Why not do the more labor intensive, higher energy use, higher friction, less convenient version of anything? Why automate anything?