I think the overgrading was unconnected to the "2 specific types of coins" I referenced. I am just saying that was where many coin collectors and many INVESTORS/bullion buyers who waded into graded coins got burned.
I know, I had many clients buy Saint-Gaudens coins for $2,000 and $2,500 and $3,000 and up. Gold was maybe $400 an ounce back then....HUGE premiums. I told them to stop and many took losses but thanked me later for cutting their losses and not buying more as we went even higher on the upside.
As for technical grading into market-based grading....beyond my pay grade, discussed ad nauseum here and elsewhere....so I'll just say "It is what it is" and for better or worse you had a subtle switch over the years. And as market grading took hold, you got the looser standards accelerate within that format.
My understanding is that John Albanese personally looks at every CAC'd coin -- but I stand ready to be corrected by those who actually submit and/or have spoken to JA. If his review percentage is less than 100%, it's still probably close to that on Saints and gold coins, as those seem to be of particular interest to him and CAC.