alk3997, never stated that it shields the bitstream, nor keeps the 1's and 0's from getting mixed up. The metal under the "hood" or plastic helps make the connector sturdier, but also helps to shield from emf & RFI, which can cause interference with the bit stream. Keep in mind, there is error correction going on to maintain the stream, but without the shielding, you would actually see the stream fail. That means that you would have macro blocking and pixelation, or no picture at all.
It has been proven in tests through manufacturers, and especially the military, that better connectors stand up to a higher tolerance of less failure rates. Same with cheap vs. better cables. But hey, take it how you want, and over think the process as most tend to do on these forums. I personally take it the better route of not over thinking, or attempting to play EE like some tend to do. Then you have those who assume that they have to be the forum police and stop all that they disagree with, because that is not the way that things should be stated, due to you did not check with them first, to make sure that it was okay to post on a board, that they seem to think that they are the owner of.