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"and IF ALL THOSE OTHER VARIABLES (same rim diameter, the same sidewall height, the same rubber compound, the same construction, etc.) ARE THE SAME, then yes, skinnier is better 100% of the time."
I found on a Michelin site once upon a time, where they said the optimum contact patch geometry for low r.r. is a "square" patch. Go too skinny and the patch is no longer square. Go too skinny on bicycle tires and r.r. goes UP. Ever notice the special tires made for super high mileage competition vehicles? They are actually WIDER than commonly available bicycle tires. Hmmmm.
"Can you accept that less frontal area is better for aero?"
Maybe, maybe not. Since most of the time the vehicle is operating in a yawed condition...
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