This allows us to focus more on the facts at hand rather than getting caught up in doing interpretations of interpretations of the news. It would be very liberating if it were possible, but it's mostly self-deluding. By pretending that objectivity is possible, news organizations lull news consumers into a sense of false security. More complicated than political bias, which is pretty easy to spot, are other kinds of bias which don't have that much to do with politics, but have a lot to do with the narrative conventions of journalism.
Conflict is emphasized over consensus.
Crime is consistently overreported. Novelty is more valued than everyday occurences which are more likely to have a big impact on our lives. And so on. News organizations deliver news and, in so doing, make decisions about what stories are important, which sources are reliable, what angles to take on a story, not to mention the editorial pages. As long as that's in place, we should encourage them to live up to this mantra as much as possible, but also know that objectivity is not even close to being practicable, and so develop our media-savvy.