The weight and bulk consideration is very relative to the weight and bulk of the mammal using the device. For me, the added "weight and bulk" of a case is not just negligible, but positive. A case softens the edges of a hard plastic rectangle and adds the option of not holding it up in the first place, while also offering more ways to grip the device. For someone 60% my mass and build who rarely exerts themselves against anything more resistant than a car door or a keyboard, the equation is probably different.
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