brochure design should be attractive enough to please its intended audience but it should be ensured that it doesn't overshadow the main purpose of the brochure. All these things should add precedence to the main purpose of the print design.
What you mentioned is absolutely right. Brochure plays an important role in the company's progress. Not only brochure but all the print designs like flyers, posters, rack cards, business cards all are essential part of an organization.