I don't understand these posts saying "have X all season or AT tires, drove home in a blizzard, and alll was well"
No one is suggesting that a truck, which in and of itself is already so high off the ground with a rather large radius tire (and then throw 4x4 in the mix...) is going to struggle driving in the snow. Why would it? I drove a Corolla as a kid all year round with bald all seasons and never once got stuck.
The difference between dedicated snows and the rest is when the moron in front of you abruptly brakes hard, requiring you do either do the same on a patch of ice or to perform an evasive maneuver. That is why people buy snow tires.