Yes at times they fall short but at other times they are dialed in and you witness streaks of repeaters. Why don't they work all the time? One reason no matter how great your toss is there is a significant percentage that are off axis and completely random. We forget about that little fact. But once your toss gets very fluid meaning you can execute it blindfolded there is a chance for a streak or two of your signature numbers. . Too many DI ers try to toss the perfect toss and they find something is missing.Also dice gliding off your hand brings more confidence and hey you find yourself on a run. I asked MP why there is no momentum in DI? He said you start from scratch every time and build from there. It's called the " Big Picture"