I think part of the problem is folks wanting to much, having their cake and eating it too. DWR seems to be eating away some of the performance a windshell is designed for. I think I read somewhere that as the HH goes up on a lot of these products the CFM goes down. The most I want my windshirt to do is shed some dew, I'm not interested in it keeping me dry from storm clouds, but so many people nowadays seem to think they should be usable for both wind and rain that companies are trying to fulfill their desires.
At least that's what I seem to be noticing, I could be reading it completely wrong.