I disagree. A featured article just needs to include all the points that readers are looking for, and the number of words doesn't always do that. Include your own pictures, or videos, or polls, maps.. write enough to get your point across, but not so much that nobody gives a damn and just scrolls through. Use your own judgment. Would you scroll past your article, or is it interesting enough to keep reading? Give readers what they want and you'll have a featured article, easy..