We have all probably learned about some aspect of photography by seeing an image that moved us and then questioning and investigating how such an image was made. Those photographers who choose to disclose the technical aspects of their work allow other practitioners to learn from their efforts. Personally, I learned about gum printing from seeing Steichen's work and then reading up on his technique. Same with Strand and photogravure.
I'm sure electric guitar enthusiasts have an equal interest in learning what guitars, amps, pick-ups, strings, effects pedals and mics their heroes use, while the rest of us are content just to listen to the songs in blissful ignorance of all that.