Dynamic Range

If you are following the technical presentations about new cameras you will always hear and read about dynamic range. Why is it sometimes good to have a huge dynamic range? This is what I would like to show you in my example. Both results are out of the same RAW file, shot in a small church in Oxford. You can see that we have a lot of lights and shadows. Left is the raw results without any adjustments, right is the final result with only a few adjustments in Adobe Lightroom. This is possible without increasing the grain or creating banding.