I think it's worth pointing out that 112 (and other common rejections like 101) may have more public writing about them than almost any other part of the law since every patent rejection is public record, but it's still pretty subjective at the examination stage.
that's true, but the 112 section of the statute says you have to prove that you "have" the invention, with a Written Description and an Enabling specification. Examiners do make 112 rejections all the time. This merely implements the intentions of 112.