Unfortunately, this presumes that all cars of the same make and model will be able to withstand the same gross abuse, contrary to the owner manual's recommendations, to the same degree. Basing your purchase on this type of destructive abuse, which is neither consistently reproducible nor within the scope of the car's requirements, is foolish.
I don't purchase a stapler based on which stapler can be hammered through a concrete wall. I purchase a stapler based on its ability to staple paper in the context of an office environment.
No, to me it seems simply to presume that there will not be enormous variations in the durability of different samples of the same make and model with the exception of those caused by manufacturer's error. As for the owner's manual, some cars have manuals that do not advise against rough use, to continue this vehicle analogy. For a concrete example, ask Ranger Knives or Busse reps whether their knives should only be used for cutting or whether they're "go" and "guaranteed" for "abuse" as well.
I think your stapler purchasing policy is a sound and agreeable one. But then, I do not think it includes buying a stapler that's excessively heavy, thick of build and somewhat less efficient than smaller, cheaper staplers in stapling paper in the office environment, does it? Because this is exactly what the likes of thick, heavy knives like the Project I are in the knife world - they are "tactical staplers", not so good at stapling but better than regular staplers for use as a makeshift hammer or club. And do you know what this makes them if they fail to do very well in this hammer and club role? Staplers that suck in every way except perhaps looking imposing and being expensive.