I take it none of you guys against it have seen a proper flush fitting contour following metal tilt and external slide sunroof then? I say this because if you had you wouldn't be kicking up the fuss you are now. The mazda MX3 for instance comes with exactly that and apart from a minute seal seam you wouldn't even know it was there.
I constantly drive with my sunroof tilted. It affords me fresh air when opening the window is going to disturb the air across my face causing me a distraction, or in wet weather when it will result in water coming in, and it also helps when demisting at full heat belt as the moisture needs a way out when it comes off the window. When pelting down the road a full slide sunroof will pull the hot air out of the car a lot less obtrusively than having the windows open. Yes aircon works well but as a rule I try to only use that when I am stuck in traffic, as aircon isn't really all that healthy for you.