I think publishing useful CGC guidelines would be an impossible task. There are just so many different combinations of defects, flaws, wear, and aging that any complete guidelines would take up a large chunk of the internet.
I know people point to Overstreet's guidelines as an example. They are somewhat useful. But they are also woefully incomplete.
I also can imagine the kind of lawyering that CGC would be subject to if they did publish any standards. "Mr. Litch, may I turn your attention to subsection 67c, paragraph k, wherein..."
I guess I believe grading is more an art than a science. And art doesn't lend itself well to any type of rigid standards.
So it is a mystic art, that only CGC staff have the capacity to comprehend
I didn't say that. Or anything close to that.
There are many people who can accurately predict CGC's grades with a fairly high degree of accuracy. If only CGC had the capacity to understand their grading standards, that wouldn't be the case.