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Do not misunderstand, it is not that film is difficult. Dark Souls is a game where every system works together harmoniously to produce an effect on the participant which is greater than the sum of it's parts.
Briefly; the challenging combat produces stress by draining a fixed allocation of resources as you explore an area. The tension caused by diminishing resources produces a true sense of exploration complete with fear, anxiety and conquest once you reach the safety of a bonfire. All underpinned by a real threat of losing time and progress if you were to be unsuccessful. Finally the key to success is mindfulness, being present allows you to read and respond to attack animations successfully. Slowly building a real sense of accomplishment and efficacy as your skill progresses causes losses to diminish.
Film is the same way. You set out with a fixed allocation of resources, your mistakes are punished in a tangible way by loss of money. Tension is maintained as resources drain and victory is achieved through mindfulness, being able to calculate whether a shot is good enough to expend resources on. It also builds a sense of efficacy through a similar mechanism of minimizing losses and mistakes.
Digital has no stakes. You have infinite attempts at a shot only limited by battery life. If you still fail you are granted almost unlimited flexibility in post to correct those mistakes meaning there is no failure and thus no tension.
The end result is of course the same, you only get good photos if you are a good photographer. But the sense of having accomplished something is much greater on one system than the other.