Datapoint: 6L (bulkhead window in the rear J cabin) is my favorite seat on the non-Polaris 789. Was very pleased to see that when my aircraft yesterday was swapped to a Polaris-configured 789, my 6L was automatically moved to 9L (which is the comparable bulkhead window seat with larger footrest). Was worried it might just keep me in 6L (not an ideal seat in the Polaris configuration), but the system seems to be programed with some intelligence wrt comparable seats during aircraft swaps.

-FlyerBeek