Peer reviewing is very important because it allows others to evaluate the constants in the article is true and scientifically accurate. It is usually finished by people working on the similar topics.
The benefit for peer review is that it allows the editors to give advice for the article to be more readable to an audience outside of the scientists who preformed the experiment. With more people doing the peer reviewing, the more reliable the article will be. However, peer reviewing could take time and causing the submission on the paper to get push back.