I am not saying to admire the technical aspects of a photo but the aspects that are part of the medium and its art that can't be described unless you somehow know about them through your experience with photography
I don't know how old you are, Nikos, but if, as I suspect, you came of age at the turn of the millenium, there is something that is beyond your knowledge and that may be clouding your judgement. There was a time, before advent of digital photography and, even more importantly, of the iPhone, when everybody—or just about—had some experience with photography, that is, with using a film camera. They were everywhere.
So if you had a family, you had a film camera. If you traveled, you had a film camera. That's how people recorded memories. And people actually looked at them—looked at, not scrolled through—alone, with the family, with friends.
This means many, many people had experience with photography. They knew the basics of the craft of photography. Meaning they knew how to focus (until autofocus arrived, of course, but even afterwards they still knew what that meant), they knew about overexposure and underexposure, they knew about f-stops and often also about sunny 16, and knew that if your speed was too low people would be blurred.
And those who wanted to know a little more could get a magazine sur as
Popular Photography, or the equivalent in whichever country you lived in, or take a darkroom class in college.
All this to say that there was a photographic culture, and a culture about photography, that was immensely different than it is today. And also about photographers, because you had magazines like
Life or
Harper's Bazaar that made household names out of photographers that most people today don't have a cue about.
To think that Susan Sontag did not have hands-on and frequent experience with a camera is absurd—it would be a statistical aberration. Susan Sontag grew up in that culture, was part of that culture, understood that culture. In fact, if you don't understand how different the photographic culture was back then, you lose part of what
About Photography is about, because it was written within a photographic culture—a culture about photography and about making photographs—that is wildly different than the culture of the iPhone, Facebook and Instagram.