Why is writing important?

I would love for my career to be in the entertainment industry.  I worked on a movie for six months and am already loving it.  Whether it be acting, directing, or sound mixing, any department would be loads of fun.  If I were to act or direct, communication and writing would be crucial.  Actors need to know how to communicate in a variety of ways in an even bigger variety of personalities.  Directors have to know how to write screenplays and direct the actors to the specific emotion he is trying to construe.  Communication is key in the entertainment industry because it essentially is how we are entertained.  I would have to learn to write screenplays and have more of an extroverted communication style to keep people interested.