Laying LAN in a purchased prefabricated house - timber frame construction

Quick question: Why should one always install duplex in the home network?

Whether you lay two separate network cables or a duplex cable is basically irrelevant. I find two separate cables a bit easier to install, especially when you have to go around a corner somewhere.

A network socket should always be designed as a double socket. It doesn't take up more space than a single socket, and whether you lay one or two cables makes little difference in terms of effort. Depending on the situation, you can also save yourself a switch if you have two devices. You can also repurpose a second network line for an analog phone or fax. As the saying goes: It's better to have than to need!

You are right, but of course one could also use a Cat.8.1 connector, then it’s not automatically Cat.8 but better than Cat.6a. ;)

And the GG45 connectors are not compatible with RJ45. Therefore, they probably will definitely not become established.

Cat.8.1 uses RJ45 connectors. ;)

Easier?

Yes, everything via WiFi or Powerline. In my opinion, networks are totally overrated (ditto: Sat-TV).

… or Powerline. In my opinion, networking is totally overrated (ditto: Sat-TV).

I have tried Powerline. It was not satisfactory.