Unbelievable. My dealer must be a real dipshit. If this is the correct behavior (I am not doubting you at all), you'd think a dealer would know this. Since so many have had this issue, it rings true what you say about moisture on the evaporator because that was a frequent thing that happened to me in previous vehicles (before I got the coolest ride I have ever had!).
PS...can someone take a look at my post in the FAQ forum regarding hot (warm really) air coming out of the vents when the thermostat is turned all the way down? The thermometer on the rear view says 62 F, yet I have to turn on the AC or open the windows...