Should early career researchers be appointed as peer reviewers?

Early career researchers (ECRs) form a large part of the scientific community but often do not get as many opportunities to review as do more tenured and established researchers. Many, in fact, contribute to peer reviews by supporting their supervisors/principal investigators in performing reviews, although they may not receive credit for their involvement. For these reasons, they tend to become excluded from the peer review process or the recognition that comes with it.