I am kind of taken aback by the growing wireless frequency clutter and was wondering if there are any smart plugs or other home automation devices that are controllable by just using the energy lines - like powerline. I mean you already have a rather reliable cable connection - why not just use it?
X-10 and the problem is it’s one way no confirmation or query of state. Lots of issues with this protocol signaling over powerline is not that easy it’s a pretty dirty place with all sorts of noise.
Use a better mesh. Z-wave 900mhz is pretty clear, casetta 400mhz as well it’s just zigbee and thread that picked 2.4ghz mostly as it means same radio worldwide while it’s slightly different frequencies so a AU zwave can not talk to US one.