When you hire a writer to produce content for your art, or want them to create content for you to create art around that writer needs to understand (or learn, however you wish to term it) your style.

If you have a dark style, they can not be producing bubbly content, they wont jive, wont look right.

Or if you have a cute style you can not try to force a dark story with cute art.

You have a style of your own, and (not an insult) you are limited in your style, you are what you are you like what you like. You need to be able to have content to fit the theme of your style or it just does not look right.