But it doesn't answer the question. Which hardware platform should I be buying now?

Should I buy more X10 modules which includes requiring their $90 USB adapter for the computer or should I go with what is considered more modern and flexible and useful, but is far more complex And is new to me.

X10 modules are about two to three times as much as a light module being $10 for a zigbee, which could be 25 bucks for X10. But the zigbee uses radio waves which may or may not work through my current wall situation. Plus the zigbee is manufacturer specific. Each manufacturer says they work with their hub only or they work with other people's hubs. But you better test it to make sure. And there are a lot of different zigbee manufacturers. X10 only got one.

So it's a massive confusion. I think I've answered my own question. Do I want to spend my time tech trouleshooting the fancy new stuff that has capabilities that I don't care about or do I just want to turn some damn switches on and off.

X10 it is.

Thank you.