Earlier quoted context omitted.
Yeah, as originally designed perhaps, but what if you could add a bit of tech to make sure your pets are safe? Or you're not coming home only to inhale carbon monoxide? I don't think $99 is a ridiculous expense for such peace of mind, even if it's not proven to be full proof just yet.
My CO alarm sounds pretty loudly. You notice it the moment you open the door again smart it does not need to be. How would you get your pet out in time if your CO alarm or smoke alarm went off when you were at work?
I find it odd that people are questioning the value of this life and death information while there are plenty of frivolous IOT devices.