The goal of the Zone System is to capture as much of the scene as possible onto the film, so that it holds detail in both the shadows and highlights.
Yes. As much as possible. Film has a very limited range compared to our eyes and a creative decision has to be made how to fit a wide range into the film's dynamic range. If done right, it sets up the best conditions to extract the information when printing in the darkroom or scanning. A straight print rarely looks good, but properly exposed and processed film increases you chances of getting what I want. But not always.
"Photography, like surfing, is an infinite process, a constantly evolving exploration of life."