- e-waste? Perhaps a microscopic amount of circuitry is added. - case rigidity? The 2015 MBP case is fine. - increases cost? No proof of this at all. - adds

- e-waste? Perhaps a microscopic amount of circuitry is added. - case rigidity? The 2015 MBP case is fine. - increases cost? No proof of this at all. - adds weight? Again, a microscopic amount of weight to the laptop, far offset by the weight of dongles. - takes up space? There's plenty of space to add this. - lets in dust and liquid? The keyboard is a far more likely culprit.