The Brulosophy exbeeriments are always food for thought and have changed the way I look at brewing, but as Marshall himself has said, they're not intended to be the last word. You still need to test the results on your own system and your own palate.
Personally, I have tried both flameout and 170F hopstands and couldn't tell any difference either. However, I have done beers with a large flameout hopstand that I didn't use any boil hops at all. (And they turned out well.) I wouldn't try that with the 170F hopstand.
Controlled experiment aside, my guess is that with the amount of hops most of us are putting in the hopstand, and the amount of dry hops we use in practice, it really doesn't matter which way you do it.
I am looking forward to Denny's experiment!