It's just simple science bud. Dragging anything across the car will leave some sort of mark. The point with a rubber blade is that anything trapped under it will be dragged and could mark the paint. The blade itself is guaranteed non scratch, just not the stuff it traps! As for cloths coming out of sealed bags, no-one is saying that, just that the towel ABSORBS the water and any residual dirt as opposed to moving across the surface. It's the same theory as the sponge vs. wash mitt.
I appriciate what your saying mate but even when patting down you will push the dirt into the paint / wax (even if there is hardly any there) and then when it comes to washing your going to drag the dirt along with the mitt... cause the dirt is more firmly fixed to the car its not going to pick up in the mitt like it would if it floated... Or even when using a wax or polish after the dirt would get picked up in the foam applicator...
If there is still water on the car in "pools" the dirt would / could / may be in a state of suspension thus when wiping with the blade it will be carried away with the water.... When thinking about it, 2 swipes with the blade clears the roof, 3 swipes on the bonnet, 1 on each side and the spoiler and job is done so no chance of swirls (but with your argument a chance of a slight scratch....) Doors and other bits dont need doing cause of using the vario lance. The whole car is then dryed with one waffle that dosnt get really wet as most of the water has gone.
Am not saying either way is right or wrong, just saying that any way of washing can cause issues but with the amount of stone chips we all pick up and the other weather conditions / state of roads in this country a few microscopic marks arnt going to worry me!
I think the point in washing with a mit and drying with a towel is that they have deeper pile with holds the dirt into the pile rather than on the surface which "minimises" the chances of scratching the paintwork. As you said though its all personal choice on how anal you want to be with your cleaning regime.
R