In my opinion, since grading is subject to human frailty, the existing level of accuracy is open for discussion. When PSA added the .5 and SGC went to the 35,45,55, it really only gave another level for debate.
Imagine, if you will, a line across the page. the leftmost point of the line is undeniably pure Crayola Blue The further you follow it across the page, it slowly morph towards green until at the rightmost it is pure, undeniable green. If every member of the board picked a point on the line when it was no longer blue, how many different points would be chosen. Color comprehension, predisposed opinions and varying levels of color blindness all would enter into the decision making process, intentionally or not. How can a sliding numerical scale with multiple variables be any more accurate?
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