Pete,
I think you are both right. Once a photographer has achieved a good knowledge of the technicalities, it is all about composition, and looking at the subject as you say.
However many still struggle with the basics. For them the ability to review the image and the histogram is a godsend.
For motorsports I normally start by chimping a few throwaway test shots, tweaking the exposure until I'm happy. I then forget all about it, concentrating instead on composition.
I usually do this as soon as I enter a "new" shooting situation. I'm usually chimping for exposure, not composition or sharpness (well, maybe 90% of the time).







