Seems like a fun restart of the discussion as winter approaches; throwing my two cents into the hat. Weirdly enough, it seems like most of the comprehensive tire tests are done in Europe with North American (NA) tests being hard to find or non-existent (maybe both). Either way, German and UK tests both have shown that in cold dry and cold wet (no snow or ice) conditions that all season tires will stop, accelerate and handle better than winter tires. Once snow or ice is present, winter tires take the lead but the all-season tires are surprisingly close and even overtake winter tires in some of the tests. It's also worth noting that the all-season tires in Europe as far as I know are the 3PMS types, not just M+S.
Just speculating here but I wonder if the rubber compound on the CrossClimate2 and other 3PMS here in NA is similar to normal M+S all-seasons but with the modified, directional tread pattern that seems to be a theme with the 3PMS tires.
It seems like there is no best tire option for the winter unless you live where the roads are covered for months at a time. Winter tires are best when the roads are snowy and icy but are much worse on dry and wet roads even when cold. 3PMS lag behind on snow and ice (sometimes) but are much better on dry and wet roads. M+S tires, assuming the rubber compound is similar to 3PMS, are worse on snow than the 3PMS but are probably the best on dry and wet roads due to their tread pattern. All of the above assume high quality tires are used.
We can debate tire viability all day but I think the bigger issue is people that put on super cheap, no-name tires and people who run tires with no tread left. There's always lots of commentary online when a video or photo pops up of someone spinning and sliding around on snow, especially here in Colorado where the person looks to be crabbing up I70 somewhere in the mountains most likely with no tread left on their tires.
Tyre Test on YouTube has a video where they compare a Michelin winter, all-season and summer in the winter in Michigan on a G70 which is pretty interesting. The summer tire does orders of magnitude worse than the other two which I expected but it’s shocking how bad the summer tire does if you’ve never seen or driven one on snow.
I'm seeing a lot of people in the Denver area have the CrossClimate2 on their cars and would be interested to hear if anyone on this forum has put them on their GV70 and once winter has taken over, what they think of them.