Homeplugs (ethernet over power) are fine for some things, but they add so much latency to the network.
Wired is so much better.
Yes, we all know that. That's what we're telling you. Nobody is installing power line if running Ethernet is simple.
You seem to be expressing shock that people would choose powerline adapters as their first choice. People are replying to tell you that it's not their first choice, but they chose it anyway because running Ethernet is often way too difficult.