Understanding the slant six

Also, that video is not accurately labelled. Correct title should be "Understanding that one guy's opinions about the Slant-6". There are previous threads both here and on slantsix.org about his…uh…what's that word the news media use when they don't want to haul off and say someone's full of beans? Oh yeah: about his controversial views, claims, and recommendations.

What would be your opinion of the perfect slant six that differs from what this guy has to say. Please explain. As far as I'm concerned, the guy in the vid seems to be on his game, having been a career expert on Mopar and other engines, and having been a racing mechanic, I would tend to trust that he knows what he is talking about. And what makes him controversial? I would like to see more proof of your claims.