your comparison is useless. GOT has almost no airballs, nor does tron or the Walking dead. Compare it to a game that has equal number of airballs and you will see just as much beat down. Unless something happened and they made the plywood in the wrong order, and a soft layer somehow was put on top. But that wouldn't be sterns fault, that would be the playfield manufacturer. And shit does happen. not saying it couldn't happen.
Hell, I had a earthshaker playfield come in, out of a game for restoration. You know what? Williams FORGOT to put lacquer on the playfield. At all. Anywhere. there as no lacquer clear at all. Went through production and put on route with bare ink the only thing protecting it. Never seen that happen before. Needless to say as soon as ME hit it. It took the ink off as if it was written on like dry erase marker.