That is why I was asking. I read a bunch of those archives from that building science Phd. Very good stuff.Hit the archives, this topic gets batted around at least once a year.
You are wrong about the asphalt shingle manufacturers being the blame for venting. I've worked on many homes that were built before asphalt shingles were made, they vented more aggressively back then. Down here I think that it was more for heat dissipation.