Did you every try them? I think the "no-season" is a stereotype. They are basically Summer tyres with extra grip, a bit louder, and a bit faster-wearing than some of the hardest Summer tyres out there. They reduce slipping in the rain and increase traction even in the Summer, which I like. In snow they are definitely enough to be completely safe driving around 20-30mph (urban areas) in a modern car in my experience.
Not stereotype. I have all seasons on my sports car that stays in the garage, and snows for everything else when winter hits. All seasons are for if you get stuck in bad weather you can barely make it home. They are terribe compared to a legit winter tire. No seasons is not a exaggeration.
I think there is sometimes confusion between all-weather and all-season tyres. Real all-season tires in Europe have 3PMSF symbol and these should be sufficient for winter.
How about all-season tyres? They wear much slower than snow tyres in my experience.
Are they available in the US? Is there not enough demand in warmer states to have supply?