Pros Cons
Less risk of conscious or unconscious bias from either the reviewer, or the author It’s not possible to guarantee the anonymity of the author. For example, if the reviewer was already familiar with their work or had heard that someone was working on a particular topic
Reviewers can feel more protected from criticism of their review Some reviewers may use their anonymity to write reviews that are rushed, rude, or unfair, which they might not do if their name was being associated with the comments