Don't most households own multiple smartphones? What makes them fundamentally different?
If someone finds their home device to be "more than a dumb box" and doesn't want to remove it from their life, you're at an impasse. No one granted you the authority to just decide where everyone else gets to draw their own personal line.
It has nowhere near 24/7 uptime.
Also, I don't carry the phone around with me everywhere.
I'd argue that those (should not) transmit audio data to any random company, but then I've never understood what Google Now/Google Assist or whatever it's called nor what Siri is about..