My home, built in 2011, has 36 ethernet ports throughout the house. Some in closets, some above the trim, some where a TV would be mounted. The TV mount areas also have conduit specifically for HDMI and other cords. And there's speakers and speaker wire going all over the house. All of it terminates in the garage at a single panel.

It's mostly unused. I have PoE wifi access points around the house. And the sound system I hardly use.