Similarly, the oven. I want alerts (audible and email) to tell me I've left the oven or hob on. But I want to choose the conditions under which I get them. I don't want alerts because I've left a slow-cooking dish on all day.
Also, ovens could deliver novel cooking instructions. Rather than the standard 200oC for 2 hours, the instructions might be 100oC for one hour, increasing to 200oC linearly over the next hour.
User control/customisability is key.