That means don't use really fancy fonts or lots of unnecessary lines or borders. (youtern.com)
So, there's no need to include that cliché and unnecessary line on your actual resume. (flexjobs.com)
Odds are, your email is one in twenty unread messages the recipient has to go through, and they're not going to want to wade through a bunch of unnecessary lines before they determine what you're talking about. (inc.com)