Originally Posted by
chaadster
Ah, good point. I was thinking more about the solar panel/battery pack situation though, where there typically isn't a fixed cable with full sized USB at one end, but rather two plug ends, one often with microUSB or an adapter, even, on top of another plug. GoalZero is an exception. But you're right that people may be running such setups without trouble; I've not, and am just speculating on what may be trouble points, and proceeding from the premise that simplicity is king, fewer pieces rule, and anywhere that a soft connection can be eliminated, it should.
As long as there is a flexible cable between the two masses (the device and the power source), it should be OK. If there's a flexible cable, there won't be any stress at the plugs.