"So many people think cameras and lenses are getting better. They are. But cameras are stupid no matter how "great" they are. They know nothing. They don't come with vision. There isn't a Decisive Moment Indicator light in the viewfinder. There's no Avedon button on the back. The most important piece of gear for a photographer is their brain."
Although this quote is not from a photographer, I still think it's applicable.