Watch this wonder goal from Argentina's Lionel Messi:
Now tell me whether the game would be the same without that announcer. Without the crowd?
Exactly. You think I'm joking, but if you've ever watched one of those games where the stadium was empty (because the crowd had gotten out of hand at a previous match), you'll know that it's a very flat experience. Boring, almost regardless of what's happening on the field.
A bit like software without community. A bit.