“…to prevent the dreaded "mist-through" in a driving rain.”

I’ve never felt that problem and I’ve been in several 8 hour doosies. Of course, I don’t know if I can sense the mist when it’s 100% humidity outside. But, in the end, none of my stuff gets wet inside my tent. I’ve tested the:
Tarptent Virga, Rainshadow, Double Rainbow, Raincloud, and GG Original Squall in hard driving rain.

My next test will be this 8oz zpack hexamid--- which I just received! shocked

-Barry