My friend's stove has an app... "Oh shit the milk is boiling over, quick get the phone, unlock it, tap the app icon, wait until it's loaded, navigate to the proper submenu and turn it off!"

Best thing it's he didn't even know at first. He bought a new washing machine that had app support, so out of curiosity he installed the app and scanned for devices, but the app only found his stove.

Technology was a mistake.

The main use cases are around notifications - it's done, it needs X/Y consumable, A/B maintenance, etc.

And with location data, turning it on when leaving the house.

Another smart scenario I can think of, link it with energy prices and a real-time dynamic energy contract, and/or solar panel output or battery charge levels, to only run it when it's cheapest to do so.

Of course, that means having it stand-by to run at all times, meaning it may run half-empty and you need to keep the door closed which will cause mold etc.