Some form of this needs to be a feature. I too came back to over done food. I can imagine if I had left the house thinking it would turn off, only to come back to a house on fire. If it comes down to it, I’d choose food spoilage over a house fire.
Considering we can make the judgment call on whether or not to eat potentially spoiled food, if we left the house under the impression a smart oven would be smart enough to turn off after cooking, but not doing so, resulting in a $300 000 house fire then who is most likely to be held accountable?
I thought of the following which may also address liability concerns:
Forced timer else cooking doesn’t start. (Prevents person from walking away and forgetting )
Single stage and end of last stage:
one minute warning
Top element off, bottom element off, rear element and fan off.
Target temp: 140°F (holding temp)
Humidity:100% (until temp is reduced enough where burning, smoldering, fire, is unlikely to happen)
Bottom element on. Target temp: 140°f Humidity 0%
initialize counter to display the time the food has been holding
send phone notifications and commence oven beeping at predetermined intervals.
At the two hour mark oven turns off with error code and a final notification that suggests the food should be discarded.