I do wonder why people get studs. Besides the Model S, I have an awd Audi s4, and I've never had any problems going skiing, even on the worst weather with chains or AWD required. I suppose if there was deep snow I wouldn't be able to go, but the mtn passes wouldn't be open with deep snow. If I traveled off the highways and the roads were unplowed, studs might be needed, but I only seem to visit ski areas and maybe drive to towns around them, like many people in the seattle area.