I believe it's required, creativity is what helps us evolve with innovative ideas but I believe it's harsh to grade people based upon it, some people have it and others don't it's as simple as that.
In exams over here we weren't graded based on how creative we were but the structure in how we wrote the story we created, in school conditions it's measuring how well you can write your own piece of work rather than analyzing and dissecting someone elses work along with your vocabulary and use of grammar.