For the situations when you can't use longer shutter time or a flash, more sensitivity is always welcome, without an upper bound. As long as the images don't ge

For the situations when you can't use longer shutter time or a flash, more sensitivity is always welcome, without an upper bound. As long as the images don't get too noisy or have distracting noise reduction artefacts. It allows you to use shorter shutter time when needed. Like sports, nature, in a moving vehicle, etc. Same goes for dynamic range, although that's often something you can control when shooting. Although it does give you more options and lowers the chance of burning highlights or having noisy shadows.