The image your DSLR shows you in your LCD should be used mainly to check your framing and exposure. Even so, as the image I've used in the composite of the camera below shows, your LCD can fool you. My goal shooting that presentation was to get the stage lighting under control. That could easily be blown out, loosing detail. Bracketing shots was not a good option because nobody was standing or sitting still.
I knew I could bring out some details of the audience in developing and the finished image is what I had in mind. Creative use of good equipment will lead to satisfying photos.