Obviously you were being sarcastic, but at the same time there was a clear point to your post (as there almost always is with sarcasm). It seemed very much like you were over-exaggerating to highlight that you thought people here have an unhealthy obsession with voice chat - joking that before voice chat, to us all games must have been crap.
Of course, your joke comment backfired because Ramar basically substituted voice chat in your example of games of the past with chatting to people who were playing games with you locally.
In short, voice chat is there because just like when you played multiplayer locally in the past, you generally want to chat to the people you're playing with.