always expectations for time/benefit trade-offs with any feature. A lot of these calls end up being forced during a production cycle, and the product manager has to be a couple steps ahead of potential issues to ensure that the final product strikes the right balance of time to market and success in the market.
Analytics – in the end, the team largely depends on the product manager to have run the numbers, and have the detail on what pieces of the feature are critical to hitting the goals for the feature. They also expect the product manager to have a deep understanding of the performance of existing features (and competitor features), if any.