Scott, what you say is true, but I think only at the margins. I want grip. I want my tires to grip the surface, and only real winter tires do a good job of that on ice & snow.
"4 wheels driving will beat 2 wheels driving if you are on a slick grade starting from a stop." Again, only if the tires grip. I've got many thousands of snowy miles on FWD with 4 good snows, and know I'm safer than AWD with all seasons. And, some all seasons are better than others. And, the amount of wear and heat cycling on the all seasons matters a lot. Some of that hot summer wear just hardens the all season rubber. The tread looks deep enough, but that isn't the same as good grip. Currently the car & truck are both 4wd with 4 snows. The Blizzaks on the truck are great. The Hankook i*cept evo are disappointing on ice, still much better than the best all seasons.
Oh yeah, not arguing the snow tire side of things..it's more a vehicle dynamics statement. I just don't like half-truths or people giving only part of the story.