Too Long; Didn't Read
I would like to offer you an analogy. A product manager is best compared to Oscar Diggs, or for those of us less familiar with the literary works of L. Frank Baum; the Wizard of Oz. They, like the sorcerer that rules over the land of Oz, possess the powerful ability to bestow upon their followers whatever they seek most. Instead of brains, heart, or ruby slippers, the product manager delivers detail-oriented decision making, speed to market, and –sometimes in the case of CRUD apps– ruby codebases.