Not getting stuck is one thing but actually stopping, which is likely more important than anything, is another.

Unless you’re driving some sort of heavy duty off-road tire then I cannot imagine you would live near the Rockies and not have winter tires. I would also consider it irresponsible to deliberately drive without winter tires. Never mind your own life, you are endangering others and potentially causing congestion if you’re ever that person that gets stuck on an icy hill (4wd doesn’t always make a difference) blocking everyone else behind you. The tread compound on winter tires is specifically designed for cold temps. All-season and all-terrain tires are less useful/safe when you compare to a proper winter tire. I also got 6 seasons out of my Michelin x-ice xi2’s so yeah you need to buy extra tires up front but you’re also extending the overall life of your tires too.