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just fire.
The drywall is to prevent the house/garage from burning down, essentially it is a rock that is a uniform thickness.
the plywood would last longer at the same thickness it just wouldn't be fire resistant.
An uninsulated garage door will lose and gain more heat than an uninsulated wall. Metal conducts heat much faster than a wall, even an uninsulated one.
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Just trying to save a little more money! 
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