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Most car manufactures they choose a tire based on 2 things: fuel economy (usually a harder tire) and price. They don't look specifically at traction in snow/ice. Its up to the customer to swap out the tires to their specific needs.
again, all-season tires are kind of a mis-leading in some markets (ie. western canada) and people really do expect more from their factory tire. It's an unfortunate reality.
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