I can understand why they would say that-they're in the tire business. I think what they mean is for everyday use in mixed weather-rain, sleet, etc. you want a deep treaded snow tire, which makes sense.

The buses that run in Yosemite have chains on them and they are running on pavement a lot of the time. I don't see the difference, and they weigh a heck of a lot more than a car. The bus chains are huge-the links are about the size of a carabiner.