You know that's a good point. My first silnylon tent shocked me the first time I was seriously rained on...that tent had to have weighed 5 pounds!! I shook it and shook it and could NOT get the water off. At first I thought there was something wrong with my DWR...
My hexamid, on the other hand, seems nearly dry with one or two good shakes in the am, even if I was rained on overnight.
I like your observation