It should be noted that once people discover the zone system they tend to go to the other extreme and start making very flat prints. Ansel's early prints with the ZS are often criticised for being flat, whereas his later prints were more "operatic". I suppose we all go through these phases in our photography; starting out with no sense of contrast, then we're cautious ("watch those highlights!"), then eventually we loosen up and work with contrast intuitively depending on what the image requires. It's the same with composition I find - wanting to return to that instinctive approach we had at the beginning, but a developed instinct, as Bresson would say.