Isn’t it dangerous to have one hand on the wheel?

‘I often see people holding the steering wheel with one hand, preferably leaning on top of the steering wheel. Apparently that’s rough. I also see it on TV when there is filming in a car. Is it no longer pointed out during driving lessons that this is dangerous?’, asks reader B. van de Kerkhof in the weekly question & answer section of our car editors. “You have absolutely no control over the vehicle when something happens and you are always late to correct.”