Any connector's signal or power strength depends on the stable and secure touching of two contact surfaces. Unfortunately, in some cases, users report issues with poor contact quality, resulting from either the low-quality design of the internal components or inadequate manufacturing practices that jeopardize the connector seal.
Additionally, while a boxy form can be beneficial in some regards, rectangular shapes can also create some inefficiencies. For example, a rectangular connector wastes a lot of space in low pin-count designs.
