One of the things that distinguishes the stage from the other modes is that it is more art centered. Not by design, but simply as a result of the sheer quantity of it. The vast amounts of money involved in the production of an average film dwarfs that spent on an average stage production. Vast amounts of money mean vast amounts of risk. To minimize risk it is often the bean-counters who make what should be artistic decisions.
Films tend to play it safe by copying other recent successes and following proven formulas.
They use the same marketing techniques as other businesses, such as test audiences and focus groups. They most often think of what they create as a product, not art. Of course not. Each medium has differing agendas and a different focus. Some films are very artistic, and some plays silly and insignificant.