Homeplugs (ethernet over power) are fine for some things, but they add so much latency to the network.
Wired is so much better.
It's old magic too and in a pinch it works reasonably well.
We use this as a networking option for an old dorm I was in which didn't have ethernet and the concrete walls between rooms made Wi-Fi unusable.
Blocks of rooms were not separated on different circuits which made this possible