I have no recollection of that. Where did you read that?
Back in January;
Rob,
Loose enough to provide the intended motion, not loose enough to provide any other motion. How's that? 
In
this thread.
And that's the problem. It is subjective. That's why you and I have different understandings of what it is/should be. You may not agree with my interpretation, I don't agree with yours. Who's to say who's right when it's subjective?
The tech inspector.
It doesn't matter how well written the rules, regulations, laws are; there will always be some level of subjectivity. That's why we have courts, arbitration, and tech inspectors.
If you read the rules one way, and the techo reads them another, then you have the opportunity to put forward your case.
Likeways, the techo has the right to put their case forward. And so we resolve the matter, hopefully.
Why create an encyclopedia of rules, when the underlying "spirit" of retro is all that should be required.
Have fun, build cars, win a few, lose a few, have fun. It should be that simple.