Well, I have to dissent somewhat from this "truth" in the OP.
When I shot dance on Tmax 400 pushed to I used 10 -20 rolls of film to get enough usable shots for the company on average. This was a normal sort of amount for this task and my colleagues shot the same amount of film. Film was a cheap compared to failure though shouting too little.
With digital when I shoot architecture I might shoot 20 frames due to the time spent setting up a tilt shift lens on a tripod.
But yes, the machine gun spray and pray I see with genres such as sport and photojournalism make me wince. A guy on DPR shot 18000 frames in and afternoon and made a thread to complain about his camera giving up the ghost.