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Originally Posted by CrowsFeast
The difference I think is what's being considered 'cold'. Under 7*C (45* in weird units for you folks) most all seasons are already starting to get hard and it's time to put on true winter tires; no matter the conditions. Once you get into snow territory then you really should have winter tires.
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Most *decent* all-seasons are fine down to much *much* colder temps than 45*F. And there are all-seasons that are pretty good in some limited snow.
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Lots of people think "oh it's fine, I can control the car ok" but then if they get convinced to try real winter tires they realize just how much better they are.
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Performance varies between winter tires just like it does with all-seasons, and any category. Ferinstance while my Pirelli SottoZero3 winter tires are pretty great in warm wet and dry conditions, they aren't as good in the snow as other winter tires I've run, probably only about as good as the best-in-snow all-seasons. And some winter tires lose all their advantage in winter conditions at half-worn, not so great...
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This is why I have 3 sets of tires; summer, winter, track! 
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I have winter tires for winter because I *know* I'll have to drive in snow a fair amount. For those who live in climates without much/any snow, *good* all-seasons make more sense, even if temps get below freezing and some some light(ish) snow may be in the cards.
Oh yeah, I'm comfortable with metric units, but F are better units for humans than C. Where C is standard, thermostats have to have 0.5C increments because Celsius degrees are about 2x too big! Something to be said for a scale where 100 is damhot and 0 is damcold, vs. arbitrarily going with freezing point and boiling point of water at standard sea-level conditions. Too few degrees for too wide a temp spread.