Just doing quick mental accounting of my devices: leak sensor, a few door and window sensors, ceiling mounted monoxide and fire detectors, a motion detector… none of that I'd really want to run the mains to. And seriously, if I had to run cable to those I'd rather much have 2-wire Ethernet with PoE.

The fridge, washer and dryer have integrated IoT but there'd be little point running just these over power lines.