The Polaris Cabin is very nice - it is not going to be left in the dust. In my perfect world it would be slightly wider and a couple of inches longer - but you have to work with that thing they call airplane dimensions. It definitely does not need a door.
Good for AA getting new cabins - that only tells me AA was likely overdue for a refresh.
At some point the Polaris cabins will be overdue - but we aren't anywhere near that time.
UA led the way with US carriers on the cabin - as that journey completes - time to invest in food and beverage.