The entire purpose of TPG is to identify the hard-to-see flaws in an otherwise immaculate piece of cardboard. If a real blazer gets a 4, you know there is a hairline crease. What you are really advocating for is a PSA 9 (CR). It makes no sense to have qualifiers for some flaws but not others. And why would you need a qualifer for centering or miscut? A miscut card is the most obvious flaw imaginable.
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