The other day I saw a good example of why hands free are not terribly sensible either. I was on the bus in a traffic jam. Car pulls alongside and I have plenty of time to observe his end of a very animated conversation. He is waving his arms in the air to try to make his point. The only time he touches the steering wheel is to bash his hands on it to empasise something. Luckily we were moving very slowly at the time.