CGC has given 2 reasons for making this decision. They are the first 2 sentences of their announcement.
The first sentence - "Because CGC members now have free access to Grader Notes, not as many defects will be listed on the certification label." This is false. Well, not completely. It would be more accurate if the word "some" would've been included. I hope CGC didn't intentionally try to mislead people, but I feel, given their history, they probably did.
The second sentence ... "Based on feedback from prominent members of the collecting community, Certified Guaranty Company® (CGC®) is implementing a change that will reduce the number of defects that are identified on the comic book label. " Although, it can't be proven to be false, none of these so-called "prominent members" have come forward. The general consensus is that it also is false and CGC is, once again, trying to mislead people.
It's pretty telling that CGC hasn't addressed either of these points even though they have been asked about them since the announcement came out. I have personally talked to 2 different people at CS (Jennifer and Dean) and neither have answered my questions ... Why was this decision made? and What are the upsides to CGC comic buyers that this decision brings?
Wouldn't it be nice if just once our beloved (or once beloved) CGC was honest with us?