You could make the argument of why do something new and different at all. It is rare that I see something truly new. I was reading one of Pavels books on stretching a while back and noted that much of what was written in it I had read in a book called Stretching Scientifically 18 years ago. I don't think there is one perfect fitness training system. I think some are more dangereous than others or one may be more market driven than another but what makes a system yeild good results is: compliance, progressions, specificity. Any system has a design in mind and a purpose for that design. What is the goal of that system? Is the system designed for increasing strength, mass, coordination, endurance or a little bit of all the above? Careful consideration needs to be given to your goals and the purpose of that system. The progressions have to be realistic. Most systems move too fast in one way or another which does not allow the body time to adapt to the increasing work loads. Time under load in whatever form needs to be carfully and incrementally increased to avoid injury. Once you've decided on a system and understand the goals and progressions of that system, stay within its disign. Sneaking extra sets or overlapping systems with the mind set of "more is better" is not always true. Sometimes more rest is better.
So why look for something new and different? Because we get tired of the same old thing. Sand bags look like they could be fun, they break the confines of the weight room, weight machines and specific movements. I think they were intended to be used for combative arts training because they don't react in a specific or predictable way each time like a barbell or machine does. They mimic the unpredictablity of an opponent. If you have a good fitness/strength base before you take one on I think you're no more likely to get hurt using one than you are while using a barbell. If you are foolish, you can get hurt doing most anything.
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