I have heard that older Marine models were shipped with two straps: rubber and leather.
It's sad that they stopped this. Probably Breguet didn't want to tempt owners to swap straps on their own, once they have an alternative strap lying around that came with the watch.
My wishes to Breguet:
1.) Resume supply of both rubber and leather straps
2.) Offer strap changing tools (watch holder, two screwdrivers) for purchase by power users (own risk of course).