For every photographer, it is a dream to get everything right in the camera. However, it is not possible every time, you cannot always get your shots right. Sometimes, magnificent moments happen in a flash. In such cases, you cannot meticulously adjust your camera setting and look for the perfect lighting to get the perfect picture.
For example, if you are a wedding photographer, you need to be on the toes, so that your camera does not lose even a single memorable moment.