I've had online briskets from Creekstone with cuts in the flat. Generally nothing I can't work around. They have always been good about replacing when I complain. I had one that had no flat, big fat line through the middle of the entire flat. They gave me a credit for it. I think it comes from increased demand and trying to ramp up production. Cutters getting a little sloppy trimming.
They are good briskets, but I don't think they are necessary. Had a 2nd last weekend with a choice CAB. I think if you cook it well, it will score.