Re: They are still very much a work in progress
I was doing that with X10 kit a third of a century ago. Still am. And it isn't listening in on my conversations. Nor does it require an Internet connection.
I still have bunch of X10 kit around, still working fine doing their job. Combine with CM11 or something and you can build as elaborate systems as you wish.
I was quite inspired back in the day Steve Ciarcia's Circuit Cellar articles about HCS in Byte and have ever since have various parts of homes that I've lived in automated by X10 and homebrew solutions.