Ethernet connections might not be all that necessary if one has reliable and reasonably fast WiFi coverage where the streaming box is located. I was using WiFi connections to my various streaming boxes with Spectrum 65-Mbps 5G WiFi. I rarely had any issues with Amazon Video, Netflix, Hulu, and most apps. But a few months ago I tried trial memberships for DirecTV Now, Playstation Vue, Sling, etc. The streaming services were rather speed hungry and I was having some pixelization and freezing, especially with DirecTV Now. Afterwards I ran ethernet cables to all of my streaming devices. I suspect I wasn't really having a WiFi issue but more probably just encountering lackluster streaming services from these companies. Spectrum recently upgraded my WiFi to 200-Mbps so I could probably get by without ethernet connections, but they are faster and certainly more reliable, so I'll keep using them. If you have a lot of WiFi devices running like security cameras and multiple streaming devices running at the same time, ethernet might be a better option. I don't have a 4K TV so I don't know how much bandwidth that will require when streaming, but if you do then ethernet might definitely be the better option.
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