Why is anyone complaining about this? It's a well-known problem, even in smaller cars but especially in minivans, that the people in the rear seat can't easily hear the people in the front seat, so the people in front typically have to raise their voice. This is simply because they're facing forwards. People in the front have no problem hearing the people in the back. So this new feature certainly makes sense as it amplifies the front seated person's voice but not the people in the back. This will actually prevent people from shouting. The parents don't start by shouting... it's more like:
Child: why do they paint road signs yellow?
Mother: so they stand out better and you can see...
Child: Mommy, why do they paint road signs yellow?
Mother: SO YOU CAN SEE THEM EASIER!