The newer tread compounds and tread designs used in winter tires are a big step forward, even compared with good winter tires from a few years ago. They keep getting better all the time.
I run (very good) all-season tires on most of my vehicles during the warmer months. If I drive something in winter weather, it's equipped with dedicated winter tires. Period. Even with AWD (Audis) or 4WD (Tahoe), there is simply zero comparison between how even very good A/S tires perform in snow compared to dedicated snow tires when it comes to critical abilities like stopping and turning ("not getting stuck" is of minimal real concern IMO, I want control over what the vehicle does once it's moving). And when it comes to dealing with ice....if you haven't driven good "ice tires" then you simply cannot imagine what a difference they make. Yes, you can maintain complete control over your vehicle on glare ice, *IF* you have the right tires and know how to drive properly.
Try back-to-back comparisons between various tires and you'll become a believer. AWD/4WD are nice (I have a good thirty years of experience with AWD), but neither is as important to me as good winter tires. I'd rather drive a good 2WD vehicle with good winter tires than on of my AWD/4WD ones with all seasons.
Simply gotta have complete control over your vehicle at all times, under every condition. Exscuses like "I hit black ice, so it wasn't my fault that I caused a crash!" *really* tick me off. Yeah, I feel *VERY* strongly about this one...people who'd never drive intoxicated do drive with dangerously ill-equipped vehicles and somehow think there's a diff.
Oh, and...[INSERT another of my usual lectures here about knowing what you're doing behind the wheel] I know people who don't even do Emergency Stopping Distance tests when they get new vehicles/tires...apparently they think that "things'll just work out OK" despite having zero objective data about what to expect.