Should you turn off your air conditioner before you turn off your car?

Someone told me that their mechanic told them that they should turn off the AC before turning off their car. I disagree. Any one have a good explanation on why this should be done?
Ok here is the reason you turn your AC off prior to turning your car off. Shutting the AC down 2 minutes prior to turning off the car allows the moisture that is in the vents to dry out. This prevents mold from forming in the vent duct work. If you have ever got in to a car and turned on the vent system and smelt the mold, you know what I am talking about. this is due to the moisture that builds up in the vent system. Other then that your AC compressor (If functioning correctly) will only engage once the motor has started. if your AC compressor is engaging prior to the motor starting you have other problems on the AC system. The mold issue is the only reason why you should turn your AC off prior to turning your car off. If you have proper drainage for the AC system this is not necessary.
yes shut air off for sure

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Mold. Plus, running the AC burns more fuel. Since the air coming out of the vent is still cool for a while after you turn off the AC, why keep it on? You