With a wifi fridge for example I can know if it stops working and the temp starts rising before I have a fridge full of spoiled food.
You don’t need a wifi fridge for this. My wife and I manage this via Home Assistant and cheap Switchbot sensors. Fully self contained on my network, nothing to phone home anywhere.
The rest of the things you listed are kind of silly. If you left the oven on, that sucks, but you’re already gone. Also, who sets the oven on before leaving the house? That’s just an odd… like, really odd thing to do. Like, senility/dementia level odd, at which point what difference is a notification? And the dryer thing… well, that’s nothing a 15 minute wrinkle cycle doesn’t already solve on a dumb dryer.
That’s a fair take. I dunno, the potential security vulnerabilities outweigh any possible gains for me with most IOT devices, and I feel smart appliances are just more complicated to fix and more easily break down. Plus, the last thing I need is my washer to brick or my fridge to stop working from a botched firmware update.