Unless it has an internal camera with which you can observe the food while it's cooking, I see no advantage of using an Internet connected oven.
edit: okay, preheat, fair - that's actually useful
After you left the house: "Did I turn off the oven? Did I turn off a burner (eg slowly cooking a bean bot)?" Now you can know.
Is a (top or interior or anywhere) burner slowly leaking and should alert the owner? Maybe.
And as you said, pre-heating, though this is actually a feature that makes things more dangerous! If you or someone else was temporarily storing something not-ovenable in the oven and pre-heated remotely, you could come home to something very bad.
A "Turn off oven NOW" button on an app would be an example of "make-safe". Worst case situation is that your dinner is undercooked.
Opens app.. "whoops I did, toggle off"
> "Oh I'll have to cook soon"
Opens app.. "start preheating to x degrees, notify when ready"
> "Oh how long do I have left on my roast?
Opens app... "ok cool 30 minutes, I'll continue my workout."
I mean... putting the food in is only one short step in the very long process of an oven.
OT- give a two year old child a device and watch them crash it just by jabbing their finger at it.
They can also play with the oven at home too. You should teach them not to do those things.
If for some reason you can't teach them to use your phone responsibly then don't hand off your phone unsupervised.
All that being said, plenty of people don't have kids...
"Organic fuzzing"
So Frigidaire, or whoever, can sell data about how and when you use your oven. Maybe this info will be used to show you ads for turkeys on your phone, or even on the oven if future versions have screens.
If one's life is such a blur that they can't wait the 20 min it takes to preheat the oven, with the risks that comes with (is there something already in there that you don't know about, like a flammable cleanser, etc.) then I dunno. I think they can find other things in their lives much more useful.
All potentially lethal/flammable objects in your household would probably benefit from some kind of remote monitoring capability, assuming you can do that securely.
A similar use could be used for internet connectivity. not for people skirting sabbath rules, but someone that has the turkey in the oven but doesn't know when exactly they'll get home to eat, but want to start baking it while you're away. Not saying that is a likely of common need, but it could happen.