@Csmokey
It just doesn't make a ton of sense to me honestly. Presumably they have to record the Subgrades anyway in order to determine the Overall grade. Its just not printed on the label.
@northkorea
But the Overall Grade is based on the Subgrades for each category anyway. What you are suggesting is a recipe for problems...
Example; Why would I have my card scrutinized further by a "sub review specialist", as opposed to the standard reviewer?
If the Standard Reviewer isn't a specialist in those 4 categories, it stands to reason that the resulting grades would as a whole be higher without subgrades, as the standard reviewer is more likely to miss things that a specialist would not.
At that point it gets to the issue of were essentially paying for them to be harder on the cards. When that happens, one of the grading types ( standard vs subs ) will be devalued. All that does is hurt their business.