I have yet to see a single non-bullshit feature from any "smart" appliance, honestly.
It turns out it was a very simple Wifi ESP8622 project to wire up a reed switch + a magnetic door sensor to add such an alarm to Home Assistant.
Same - although I have experienced an interesting extension of this: HomePods now have alarm detection (the intention being to detect a smoke/burglar alarm). It is also triggered when the fridge is left open, leading to everybody in the household getting a critical alert (which ignores silent mode).
I would like a smart fridge that lets me know what is inside - so I know if I should get milk or a salad on my way home. So far nobody makes that.
I'm sure this is practically not a real issue, but my OCD paranoia cannot fathom the idea of my oven being on while I'm not at home due to safety / fire concerns.
I feel this is a terrible trade-off: a minor convenience, in exchange for a huge attack surface that could allow someone to burn your house down remotely. The folks who build IoT systems have neither the skill nor the economic incentive to keep these things secure for the 15+ year lifespan of a durable good like a cooking range.
Would be fun though, appliances can just have a "make me smart socket" with direct connection to hardware. Then it's the smart plug that needs kept updated, but more sustainable since it's used for many products. And if your manufacturer for it dies, can just replace with any other one since they'd be held to a standard.