A double gun stocked with good strong straight grained wood is really pretty resilient. The action does lock up tight so keeping all the crap out of it. Finish will wear of course, but that can be redone. Plenty of double guns have been carried for many thousands of days in the field over a century or more of use. And a boxlock is tougher than a sidelock. And with a Rizzini, I think they use a long stock bolt which reinforces the hand of the stock.

In the hands of a hunter especially a PH, a double will be carried lots and inevitably get wet, muddy, covered in dust etc. Most understand about plugging barrels and will do everything they can to avoid such actions. And a new mint finished gun just looks wrong. They need to be used, but not abused. Worn checkering and bluing just tell of many many adve

And any British or European gun will have been proof tested to much higher pressures than used in the field.