Because now since you're not required to use film to be artistic or productive with film, the only thing the film has left going for it is effort.
The effort of measuring exposure, of counting your limited shots, of making the best work you got, in a professional or artistic field, those are limitations, but in the field of amateurs fucking around with cameras it's a blessing.
Because like I said, each shot you take on film is no longer just an object of art, it's an object of memory. And the more time and effort one takes to take the shot, develop the shot and then, possibly enlarge and print the shot, the stronger the memory is.
Perhaps not for anyone else but for the photographer itself, but it still matters.