User blog comment:LegoI3rickI3uilder/Community Vote!/@comment-4041224-20130405124942/@comment-18933973-20130405134457

It should be a requirement. As Obi said about how "Use your imagination" is used as an anti-plagiarism thing, I think "Be yourself" is meant to be like an anti-impersonation rule.

Think of it this way, if it's not a requirement (meaning you don't have to be yourself), then how would you be?