Polaris 1.0 was “let’s see how many J seats we can cram into the aircraft.” For the most part, it was successful and a big improvement over IPTE seats. But then people started complaining that the even numbered Polaris seats weren’t as comfortable as the odd numbered seats. Now that the Polaris 1.0 improvements are dated, they want to install larger screens, and I suspect that the increased seat commonality is a bit more cost effective. And sadly, because they feel the need to add doors, a consistent seat design makes that easier as well.