Kind of a dumb question but what I mean is if you drop the iPhone 10 times and it doesn't have a crack in the glass, would it be weaker than if I never dropped the phone at all? Meaning the 11th drop might be the one that does it?
All kinds of things can happen. Chips can loosen on boards. Connectors can get flakey. Emphasis on "can," not "will," but it is possible and it does happen. BTW, I think sitting on phones (in back pockets) can flex them enough to cause similar issues.