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Most winter tires are essentially useless as winter tires once the tread gets below a certain point. On Blizzaks, at least they used to literally have a different tread compound in layers, so that once they were worn a certain amount, they worked better as an all-season than a dedicated winter tire. What generally doesn't work well are dedicated high-performance summer tires when it gets cold out, which I think, was the original question. THose can be downright dangerous in the cold, whether there's snow or ice, just makes it even worse.
Yes, in the dry, the block sizes and sipes may not be able to provide the same ultimate cornering and grip or feel as a dedicated summer tire, and they may wear faster, but given those considerations, under many circumstances, they will work when it gets warmer out. I wouldn't want to take a high speed trip through Death Valley in the summer with winter tires, though!
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