Oh the argument would never be phrased that way. Rather, you start from the completely uncontroversial point that a CR2032 battery is a consumable, come up with some reason why you can't use a bare cell like that and need some sort of assembly around it, and incrementally justify adding more functionality into that assembly.

Also, remember that you don't need to prove that the design is sensible, only that it isn't deliberately malicious.