As someone who writes business content for a living, I have to disagree. Writing business content, technical writing, and writing articles are as far apart from each other as they are from writing fiction or poetry. To write good business content, rather than beginning to research your topic on the web, you first need to become well grounded in your knowledge of the business and its goals and objectives. Then, whether writing for a service oriented or product oriented business, you need to know a little bit about sales.
Another difference between writing for a business and either tech writing or article writing is the length. You don't have a lot of room to tell your story becuase the reader doesn't want to spend hours... even minutes reading it. You have to be quick, concise, and balance that with informative and engaging. You make the best use of the inverted pyramid: telling your reader what's important at the top so they know they are in the right place.
Good business content is also spattered with calls to action that can range from "Contact Us!", "buy now", to clicking a link to more detailed information, to enlarge a graphic, or (these days) to watch a video.
The one thing you do have right is that you should check the competition -- not that you can use any of their info, because it may not be pertinent to your client's business, -- but just to make sure you aren't reinventing the wheel with your business content. It's great if you can update business content, but that's not always possible to do frequently. For instance, an accountant or attorney my have little news from month to month or even year to year. That's where it's important to keep the site design fresh and keep up with new trends in technology to keep the site current.