I just stumbled upon a very interesting YouTube interview from BostonCardHunter, in which he interviews a former PSA/CGC Exec who was primarily responsible for onboarding/implementing grading training for new employees. I found it very insightful especially the following two points;
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New graders lacking confidence to award PSA 10s (fearful of giving the impression they’re not able to spot card defects)
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limited pop control for scarce/ high value cards
Pop control is clearly quite a divisive issue, but it was interesting to hear him speak about the vested interest and external pressure grading companies are exposed to when it comes to ultra high end cards. Link to the video is below, skip to 18:30 if only interested in Pop control discussion, though I do think the whole video is worth a watch.