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Ok, I’ll bite.
Why does a game console need a webcam?
To allow for a live avatar. For example when playing Mario Kart online you can see the reactions of your friends your playing with. When you hit someone with a red shell and they make a mad face, you get to see it.
Microphones have been in gaming for a while, this is just the next step.
Now… Is any of that necessary? No, not really. Is it kinda neat? Maybe for some.