Consider a phone app which reads product barcodes and orders more of the same thing. You shop by pointing your phone at the empty container and telling it how many. Smarter developers might also have it recognize common fruits and vegetables. That might be useful.
I'm surprised Amazon doesn't already have such a device. They have a voice input thing and a push to buy thing. A kitchen appliance which looks and works like a price gun is a logical next step.
One of the problems with solutions like the omniscient fridge and printer is that they sound helpful but are not helpful in practice. They could benefit from testing.
Also, a structural issue: the incentives of the manufacturer (buy more stuff) are not aligned with my incentives (eliminate routine tasks).
I'm surprised Amazon doesn't already have such a device. They have a voice input thing and a push to buy thing. A kitchen appliance which looks and works like a price gun is a logical next step.