Even CR is missing a beat in its recommendations on snow tires vs. all season tires. It doesn't consider the braking disadvantage snow tires suffer from on dry and wet pavement.
For those whose winter conditions include continuous ice and snow - i.e. weeks of sub-freezing temperatures - snow tires are the only safe choice. Likewise, snow tires are the only choice for those venturing into snowy mountain passes or other snowy roads where loss of control could lead to a collision or sliding off the road into dangerous terrain.
But what about those who put snow tires on in late November, take them off in late March, and experience snow for a few weeks of weather that includes few constantly below freezing periods? We drive ~ 90% of our miles on wet or dry pavement - conditions in which snow tires perform significantly worse than all season tires. In my case, safety typically depends on two factors: 1) my ability to drive within the limits of the vehicle and road conditions; and 2) the ability of the tires to brake suddenly in traffic when something unexpected happens in front of me. I've driven for 50 years with no accidents, so I'm confident I'm not going to over-drive the conditions or the capabilities of the vehicle. But I need to be able to stop when someone in front of me screws up.
No doubt, venturing into the mountains with all season tires is risky. Not only might you get stuck, but worse, you might not be able to stop or remain on the road when the conditions get bad. I might encounter such conditions one or twice in a winter. The rest of the time, I rely on my braking to keep me safe, and with winter tires, it's not as good.
Top rated winter tires in CR - note the performance on snow, ice, dry and wet pavement.
Top rated all season tires in CR - note the performance on snow, ice, dry and wet pavement.