But you're trying to convince the reader that it is logical to move from point A to point B to point C and that, by doing this, conclusion D is warranted. If you stop to give 10 examples or batches of statistics to back up every point, the reader is going to get lost or give up on you. When facts or statistics seem warranted to bolster an assertion, one or two good ones will do. Keep it short. The longer your piece is, the harder you will have to work at keeping the reader's attention.
Short paragraphs are better.
Vary your sentence structure. Perhaps the easiest thing you can do to make good writing better. Too many long, complicated sentences, on the other hand, will make your piece dense and difficult to read. Three shorts and a long. Two of each, then one of each.