Originally Posted by BHHJEEP
You are right and they will be "Fine". The will however not be "Great", if you want to be that person who is the only other person on the road than the snow plows than you want a dedicated winter tire.
Generally, all seasons are fine. However, occasionally people may not have the luxury of working from home or just taking it easy until the roads get cleared off. Sometimes you HAVE to be out in it, and "it" may be truly awful stuff- maybe not even snow, but a quarter inch of glaze ice. The shortcomings of those all seasons will be very apparently at that point.
If my wife wasn't required to be at work at a given time come hell or high water, I wouldn't bother with winter tires on either vehicle (both my WK2 and her Infiniti G37x are AWD). But she does, and we've got some ugly hills in our neighborhood (they do a decent job of clearing them, but sometimes I get to it before the plow does), and thus I find the money and effort well spent.
At one point last winter we had a nifty little ice storm. I remember the snowplow/salt truck sliding backwards down our street (it was kinda amusing, to tell the truth). He had to lower his blade to keep from losing control entirely. I had driven my wife home in her car- it was a front drive Acura TL (a good example of a car with too much power to the front wheels... too easy to break loose on a snowy hill) wearing Continental ExtremeWinterContact tires. We were able to drive like the streets were dry when people with perfectly competent all season tires were afraid of any kind of slope. Sane people would have stayed home, but we had no choice.
It's those conditions where the dedicated winter tires really do matter.