While it isn't always there, many TVs and streaming devices do have a LAN port, or the capability to add one via USB. Why would you use it instead of Wi-Fi?
Products like the UGreen USB-C to DisplayPort 2.1 cable or the Hak5 O.MG Cable show that there's more to USB-C than charging.
Macworld At a glance Expert's Rating Pros ・Four Thunderbolt 5 ports ・More affordable than full docking station Cons ...