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Mike is correct, it is done purposely for emissions. The quicker the car gets hot, and heats up the cats, the faster it falls into the emission "zone".
Interestingly, we ran a couple side by side scold start essions on the rollers with sniffers in the exhaust, and saw very little difference between a car with the OEM stat and the lower temp unit, other than it took a couple extra seconds to line out at the same final values.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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