Journalists often emphasize that something is novel when they cover it because novelty supports something being newsworthy, and is appealing to audiences
Journalists emphasize novelty because it underlines newsworthiness.
Alternately, researchers underline novelty, particularly in papers, because it underlines technology that might be sold/transferred and thus patented, a legal space that specifically looks at novelty as a criterion. By saying something is novel in the research paper, it's more likely that a patent examiner will be primed to believe it.