I see the house dj speaker aspect, but why does anyone need the first 2 when their phones accommodate those functions?
Find the phone, unlock the phone, find and open the app, find and click the control. That requires some effort.
Saying commands, having physical buttons at the expected location in your home, NFC tags.. there's a bunch of more convenient ways to do extremely repetitive tasks that would otherwise take you more time to do.
Some people don't consistently have their phones on hand when they're at home, which would do it. And some people have problems with unwanted voice activation - my experience was that the voice-printing on "OK Google" was not actually all that personalized, and sometimes it did totally unexpected things like breaking out of navigation to make a phone call. Last time I tested it, keeping Google voice recognition on was also a massive battery drain, but I assume that's improved.
(That phone call was particularly ludicrous: Android offered me an unprompted 'helpful tip' that I could say things like "call mom", but since the tip fired when it was already listening for a navigation command, it accepted its own instruction.)
We also user audible heavily. The kids live the boxcar children readings.