Why do photographs have to have emotional impact?
Photographs can do many things - they can inform, they can intrigue, they can illustrate, they can decorate, they can inform, they can entertain, they can reassure, they can calm, they can shock, they can support other artistic endeavours, they can bore ....
A portion of those purposes can be supported by emotional impact. But only a portion.
I know that you enjoy making (digital versions of) slide shows with your photography Alan, and I appreciate those. But I would suggest that the role of "emotional impact" is considerably more important with that sort of presentation than with many others.
Ironically, strong composition is probably most important for that sort of presentation, because of the time demands of that presentation. When time is tight, you need a strong arrangement of the elements in the frame of your photograph, because you almost have to force the viewer to quickly look at the things in the frame that you want them to see, otherwise they won't have the time to appreciate the image - there certainly isn't time to wander around the image, moving slowly, and at their leisure.
At high risk, I am going to post an example from Jeff Wall's work. Jeff Wall's compositions are meticulously created, and immense amounts of time are spent upon each one of them. He creates everything he photographs - somewhat akin to the creations of a cinematographer working on a sound stage.
He also references all sorts of allegories and artistic standards in the photographs he creates.
Like much of the photography I really enjoy, this example is chock full of all sorts of interesting detail - like many of my favourites, it exalts clutter. In this case though, unlike many cluttered photographs, the placement of all the clutter is meticulous, and supports a composition that is both strong and complex.
Here is the photograph:
View attachment 263522
The title is important, because if you are familiar with Ralph Ellison's story "Invisible Man" you are more likely to enjoy the photograph, because of how it illustrates that story.
This photograph wouldn't likely fit well in a slide show, because its strengths aren't the more transitory effects of emotional impact. Instead, it compels me to return and examine it, time after time, because of how well and how completely each part of the clutter is necessary, because of how it reinforces each other part.