Personally, I don't like display backs on Divers. If a dive watch is a "Dive watch", then it's by my definition a tool watch. Dive watches have had closed backs primarily for one reason, it's safer from a water ingress standpoint. Of course, the AP diver is a diver, but it's not a "Dive watch" nobody except someone who is super rich is going to take a 15K+ watch 60 feet underwater. First because diving is hard on a watch, if you're in areas with lots of coral, it's inevitable that you are going to bang or scrape on coral heads, second getting back on a dive boat especially if the seas are a little rough is like trying to ride a mechanical bull at the state fair!! I have banged my watch, camera, dive computer on the steps or rails of dive boats plenty of times, just trying to get on the boat. All of the above is the main reason professional divers wear relatively inexpensive tough watches.
I believe the primary reason AP went to the display back on Divers was to foil the rep makers, another exercise in futility. I believe that they are alarmed by the accuracy of the high end reps, and mistakenly believe that this will make it impossible to rep the divers. Sort of like Rolex using the etched coronet on the crystal and the Rolex, Rolex, Rolex engraving on the rehaut. Stopped those nasty fakers in their tracks didn't it?
I think I'll just keep my V7