PSA, SGC, and BVG all have the same flaw: they hire human beings. Human beings lack the ability to be completely impartial. Computers are impartial however and I believe in the not-too-distant future that image processing technology will lead to automated grading.
Yes, software architects and developers are human beings, but a programming flaw (for example, an improper angle calculation for off-center/miscut/diamond-cut detection) would impartially affect all cards, regardless of whether the subject was an E98 Wagner or a 1950 Callahan Wagner.
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