Powerline networking is really noisy, the electrical wires are basically antennas. It may be easier to monitor and interfere with than wireless protocols.
There are powerline home control protocols. X10 is the big one but it is old and flawed. UPB and PLCBUS are new ones but they are proprietary. Insteon is interesting one that can do wireless and powerline but recent products have dropped powerline.
I think Matter is going to kill need for powerline. Matter goes over Wifi, Bluetooth, Thread, and Ethernet. Thread is low-power mesh like Zigbee, but should be able to use Wifi or Ethernet to bridge gaps.
IEEE 1901 can't be jammed as easily, though. 500mbps half duplex may not be amazing compared to normal WiFi, but it's plenty for a bunch of security cameras and an IoT sensor or light bulb here or there.
In every IoT scenario other than window and moisture sensors, you generally have access to a plug of some kind. I'm honestly surprised that HomePlug isn't built into IoT devices more often.
There are powerline home control protocols. X10 is the big one but it is old and flawed. UPB and PLCBUS are new ones but they are proprietary. Insteon is interesting one that can do wireless and powerline but recent products have dropped powerline.
I think Matter is going to kill need for powerline. Matter goes over Wifi, Bluetooth, Thread, and Ethernet. Thread is low-power mesh like Zigbee, but should be able to use Wifi or Ethernet to bridge gaps.