Not always. When you do studio photography for example, you are hardly "capturing the moment", you are pretty much setting up the whole architecture leading to it.
Indeed one can argue that any form of photography beyond "pull out your cellphone and take a quick snap" are not "capturing the moment". For a good picture, you've identified a good subject, moved about to find some good whitespace for your background, selected a focal point, aperture and shutter speed etc., maybe even instructed your subject or moved a distracting item away, captured O(10) images, chosen the best one and then postprocessed it in the digital darkroom.