The one that provides strain relief for lateral movements that may occur whenever anybody touches the other end of the lever you just jammed into the socket, wi

The one that provides strain relief for lateral movements that may occur whenever anybody touches the other end of the lever you just jammed into the socket, with the fulcrum being the point of contact with the connector. This is another example of sound engineering taking a back seat to user-facing design. Instead of a fully removable cap, I would have used a tether to keep it secured to the device, and the connector would be on a short cord with a 90-degree connector. A removable clip would then secure the device to the edge of the pad as it charges. Otherwise the whole thing could flop around without damage to the male connector or female socket. Though this is all with the benefit of hindsight, everyone ought to know better than to plug anything into anything else without some strain relief.