I used to be 50/50 PSA/SGC until I started using a loop to look at the backs of my pre-war especially T206's. I found a good portion of SGC had edge damage on the back, yes PSA had some as well but not nearly as much, and was very happy to hear of the design change.
I even posted on the thread about needing a Beckett type sleeve in between two thinner gaskets. No movement, better protection and keeps the aesthetic appeal.
didn't happen.