Publisher don't like to include irrelevant information regarding photography in books and lives because public like to read only photographers experiences. They love to read imaginary story and pictures. They don't like to read which camera photographer's used to captured great pictures and why they love to used that camera as well as what's features of camera. How they captured pictures? So that's why no one like to include additional information of camera and their techniques.
I doubt this is true because I always want to know that stuff but then again I'm not normal lol