WiFi may be the most convenient way to connect to the internet but it's not the most reliable or the fastest. Which is why ethernet cables still have a place in our lives because having a hard connection would make sure that the signals from your modem to your computer are stable and strong.
Still, the fact of the matter is that a wired connection is still objectively better for just about anything that requires an internet connection. Sometimes the benefits are subtle, but sometimes they're life-changing.
For example, WiFi is notoriously fickle. Thick walls and metal objects can totally throw off the signal emanating from your router and turn what should be a perfectly connected household into a depressing dead zone.
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Everything here except the Nintendo Switch and TV are hooked up via Ethernet cables. My next purchase for networking is going to be a 10 gigabit Ethernet switch.