I was actually considering buying those, because one of our dogs has the habit of suddenly jumping up at me, whining, desperately wagging her tail, looking at me with those huge doggy eyes, running in circles, digging at my forearm etc. - anything to make me understand that she really, really must have that thing right now. She just won’t for the life of her tell me what it is that she needs.
So even if the buttons may be annoying in most cases, they might still make sense in our case. The challenge will be to teach the other dog not to press the food button every minute.