Home automation exists and is cheap. There's a huge niche industry built around it. The problem is that people don't actually want it as much as they say they do. That doesn't mean it doesn't exist.

That's sort of tangential to my point. There are reasons we might not want phased array radar systems picking up every move we make in the privacy of our own homes, independent of home automation applications, which is I presume what the post I was responding to was getting at. My point is that those desires of ours are irrelevant when it comes to whether or not the applications we don't want come to pass, because at some point there's going to be a financial incentive for someone to do it anyway.

It is already here if you care to spend some money on it.