Have you ever have experiences that you really want to mute someone just like mute TV?
I do, a lot of time.
Sometimes people tend to say the same things again and again in different ways and won't tired of it(but apparently others do), and you really want to mute them. You can't actually point a controller at them like TV, but you can wear your headphone so you won't hear anything.
I don't know I can have any different experiences other than the happiness of hear what you want to hear while wearing a headphone. But at a scene you watch a group of people speaking soundless, you feel so much fun. It's like a muted live 3D advertisement.
And it is unnecessary to turn it off, because the price of inefficiency of energy usage will not add to your next month's utility bill.