You never get a second chance to make a first impression.
Don’t underestimate the importance of design. Good design cannot compensate for poor content, but it’s one of the key factors of successful technical communication. An attractively designed communication product motivates users to read it, much like an attractively wrapped present motivates its recipient to open it.
Readers stay longer in an attractive-looking document than they stay in an unattractive-looking one. Readers who are motivated and stay in the document longer are more likely to understand the given information. Users who understand the given information are more likely to use your product successfully.
A clear design and well-thought-out templates also motivate and help you, the author, to produce clear, user-friendly content.