Fair enough, but you were getting useful fallback, the image quality progressively degrading, and even with almost no image, the audio was still intelligible. W

Fair enough, but you were getting useful fallback, the image quality progressively degrading, and even with almost no image, the audio was still intelligible. With digital boradcast, it's all-or-nothing: all is fine, all is fine, until the error correction can no longer save you...and you get soundless picture, with block artifacts. Very useful for emergency broadcasts, when anything unicast will be overloaded as well.