"it is difficult to write a precise verbal description of something which is essentially visual."
For a long time, I though that was the problem. And perhaps it is for the general audience.
Unfortunately, one of the things the past few months have shown is that even looking at the same picture, one with no costumes or even partner to get in the way, is not enough to establish agreement over what simple physical facts (regardless if they good habits or bad) are actually present in the picture.
"It's fairly safe to say that once the postings get about 30 or so, the thread has lost its usefulness. So we can either stick with it or restart the topic, depending on whether we're looking for entertainment or dancing information"
Unfortunately true. While there are disagreements over basic reality, conversations are going to expand a lot. And unfortunately some aspects of the forum layout, like the indenting, make it hard to view a thread more than one post at a time.
In terms of dancing information, unfortunately there really are very few sources in this world where you can find the straight dope unencombered by distractions, mistakes, or - in this case - arguments. You can certainly go somewhere and pay for answers, but that's no guarantee of their quality. You have to either pick a teacher to trust, or learn to follow the arguments to the point where you can figure out which answers are plausible and which aren't.