If it's snowy a good modern all weather tyre can hold its own, but will brake a few feet later than a good winter tyre.
In all other conditions a good all weather is a lot better than winter tyres, and pretty close to a good summer tyre.
I've driven summer tires, all season tires, winter tires, and studded winter tires in every season in Canada. (Yes, I live in Canada and own borderline-usless summer-only tires. Yes, I've tried driving them in snow.)
None of what you're saying lines up with my own experience, various YouTube videos on braking distances, or literally anything else I've ever seen anywhere.
Edit: And, well, to be clear... I've lived on the West coast of Canada where it's a bit more mild but you're in the mountains, in the middle where it hits -50, and in the East where it only hits -30 but snows like hell.
How much do you drive on snow anyway? Probably nowhere near as long as you do on tarmac, even in a tough winter.
However the difference between winter and a modern all weather (it's a different class) isn't.
And yes, we're probably terrible drivers.
I do not live in Florida. 45N, continental winters.
I'm never using winter tyres again unless society breaks down and no one shovels the roads anymore.
For an all season that level of summer wear would be unacceptable. So a different formulation is used to improve summer wear at the cost of the winter low temp performance. You can’t have it both ways, a long wearing summer performance and good sub 40 degree grip.
Modern high quality all weather tyres are excellent in summer and winter.
Except on actual snow, where they're just ok, because of the hybrid sipe patterns, and ice, where they suck exactly as much as everything else except studded tyres (which suck on tarmac instead).