Again, ideally, everything is so well connected you'd just stop the problem before it occurs, with sufficiently smart devices. Eg, your pot detects the rise, and sees its about to overflow, it can signal the stove to lower the heat. Same with the kettle -- it gets on fire when it runs out of water, but stays on. A "smart" kettle could detect that, and shut down before the fire starts. Of course, after the fire, there's nothing it can do... but targetting the cause rather than the symptom has potential, for probably many issues

But to be clear, I'm not advocating anything -- I'm just describing why IoT is a thing, and people get excited for. I don't actually believe this universe will really exist anytime soon, as it requires "sufficiently intelligent" technology and communication, which really almost starts to approach knowing how to cook your food for you to accomplish anything non-trivial

But the belief is what drives this tech.