Thread:Uncanny X-Factor/@comment-5041674-20160227091614/@comment-1755931-20160227152535

Rollbacks are an administrative position below admins, who are able to "rollback" undesirable edits from vandals. I myself have been a rollback on a wiki before, and frankly I found the position more ceremonial than anything else. There was nothing they did that a normal user couldn't do-- though they had a special "rollback" option in a page's history, but any user can undo edits.

Basically, I don't find them necessary but they don;t hurt, per se.