1) drying with a master blaster is not quicker than other methods. In fact it can take longer if you are blowing water all over previously dried areas which is almost impossible to avoid.
2) if you missed a small area while washing (which again is almost impossible to avoid especially if you are in a hurry)...drying with air dies not eliminate the possibility of putting scratches in the paint. As soon as you wipe over the missed area (post drying step) you will scratch the paint regardless...unless you have good lubrication between the MF towel and the missed dirt. (ie air drying won't completely eliminate swirls if you have a post-drying step like applying a detail spray or spray wax/sealant).