Given the fact that the world now relies completely on what we call as the information super highway, it is best to understand that people just want things done quickly and in a snap. Studies now show that the attention spans of people nowadays have been decreasing and that they do not have much patience to read long sentences and paragraphs.
If you search through the net and observe closely that there are only a few sites that offer you lengthy writing, and most often those who are able to click on this would just close the tab and search for a new one. It is more of an instinct that people now know that they can still get information if they search for those writings that offer a lesser number of words.
And this is why it is more effective to convey information and write articles in short and simple words. Aside from the fact about people being less patient, it is also a fact that not everyone has wide vocabulary as those who are experts in writing articles. You do not have to sound very much like a professional since people may not understand what you are trying to convey.
Always remember that your main goal in creating an article is to impart information to those who are reading and as much as not to take much of their time. So keeping things simple and short is the best way to do it and I guess I definitely was able to convey this message to you in less words and hopefully you get my point.