Winter/cold weather tyres are just that, best tyres for the colder winter temperatures.
I use them not just for snow, but icing is a major issue up here and it comes in hidden 'pockets'. Not always a warning, even by temperature. I was saved by the ability to have more braking control, when the car in front of me lost control. I had to brake mid corner on black ice. Not what anyone wants to do, particularly in an emergency. I was able to brake reasonably hard with 'almost' full control. I'd have been in the ditch and trees without winter rubber.
If you think I'm over the top, I came back two hours later and they had just cleared up a further accident, where someone had lost it completely and ended up in the trees.
For me, winter tyres are not just for snow. BMW, rear wheel drive and snow, don't mix anyway.