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MattJIm - "it would be an admission that they regularly overgraded in the past. Adding half grades is not an admission of overgrading in the past. It is a refinement that would allow for certain high grade examples within a given grading teir to be formally recognized as high-end for that teir."
That's some kind of kool-aid. Bumping a half grade is not an admission of undergrading but a .5 reduction IS an admission of over-grading? I think they rounded to the closest grade previously and now, with .5 grades, they can round to the closest .5; for better or worse.