The old reliable deadbolt lock with mettle key has worked fine for centuries. The new tech does not improve the security of the home.
It didn't improve our security, but it did significantly improve convenience for us. We have a separate code for the cleaners, dog sitters, and a few friends that used to have keys. Whenever anyone comes and goes, we receive notifications on our phone. If we no longer want someone to have access to our house, we will simply delete the code.
I get what you're saying, but if we sell our home, the Nest Protects are coming with us, replaced by cheap alarms.
The other day, my wife was cooking (well, burning) something in the kitchen, and just when I noticed the smell the Nest said, "Smoke detected in the main hallway," then it basically said the alarm would sound if the smoke kept building. I opened the app, and prevented the smoke detector from sounding, then watched as the app told me the smoke was starting to dissipate.
I know it may be too expensive, but that was such a better experience than trying to tear down the old smoke alarm as it blared while also dealing with something burning in the kitchen and the pets going crazy.
The other thing I used to hate with the old smoke detectors was waking up in middle of the night to the sound of the battery warning, then trying to figure out which detector it was (the alert was short and only happened once every 2 minutes).
Your experience with addressing burning food, a loud smoke detector, and freaking pets describes our house to a T when this happens. Also, your usage case of middle of the night battery bleeps single-handedly (sp?) just convinced me to get a couple of smart detectors/alarms.