Nonsense. I have just had my Tesla S 70D serviced, they loaned me a S P85 rear wheel drive. It was horrible. Just manoeuvring in a car park was difficult because the car couldn't grip the ice. Got my 70D back today, what a relief! Sticks to the road like glue unless you push it foolishly hard. Both cars, of course, have winter tyres (stud-less).