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To answer my own question, from the Bridgestone website:
Faster wear on warm, dry pavement - the tread rubber of winter tires is considerably more flexible than that of all season and summer tires. That same pliable tread rubber that adds traction in winter will wear down quickly in warm temperatures. Summer and all-season tires are built to withstand warm temperatures, providing long wear life.
Decreased performance - In warm weather, winter tires won't provide the same handling capabilities as summer or all-season tires. Imagine if you needed to make a quick maneuver and your tires were soft and squishy. You won't get the crisp response from a winter tire in warm weather. Winter tires need that flexibilitity to handle ice and snow, but it's not as useful in warm weather.
(These still don’t feel like huge negatives to me).
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