Agreed. My Samsung TV is not connected to Ethernet/WiFi and I have a quadcore Pentium NUC as a 4k HTPC for interacting with it. I have a full control of what I run on NUC (Ubuntu + Kodi) and TV is just a display.
My Marantz is connected to Internet though (used for AirPlay) as it needs updates to its firmware, so there might be some audiophile listening...