The overall site navigation menus and use of text and graphics have to be very much limited in every business template. If you use too much text the visitors will feel lethargy to read. At the same time excessive graphics to make the site standout in the crowd is no use if the visitors do not get the clear idea about your website. The navigation menus have to be bold and attractive to the visitors. The overall site needs to be user_friendly.
If you understand the principles behind website templates you will immediately see the huge benefits to WordPress template systems. Basically it is designed to hookup automated template ideas to a system via which a client who knows nothing about anything can access your site (behind password protection obviously) and update and manage the website that you leave him.