As for the second picture, I think that there is a common mis preception amoung the public that materials listed for use in house wiring would also more than qualify for use for making extension cord sets.
It's also obvious to all of us (but probably not to most end users) that BX-type cable sheaths leave a very sharp edge that has to be covered up. This is not the case with the pictures below.
The wires enter the cord caps but the sharp edge of the armor is still prone to rubbing against the two or three conductors inside. Eventually the insulation will be sliced up and the installation will go out with a bang...ahem....