I also saw powerful product managers get support from higher-ups and then shovel their ideas down the throat of engineering orgs. A PM in Uber's Marketplace org used to create and present a brand new architecture for the entire Uber's marketplace. It was not concrete enough. It didn't really convince people of what problems to solve. It was not even a good architecture (maybe it was, but at least few people got convinced). In fact, the presentation didn't even get many questions but hundreds of blank stares. Needless to say, the architecture was not implemented. It was nevertheless quite a humiliation to the marketplace's eng org.