The document discusses how the author's company initially thought their product tour was successful because it increased engagement metrics. However, they later learned engagement may not be the best metric. Bounce rates increased and some users said the tour was annoying. Further analysis found the tour actually decreased non-tour content clicks by 20% while increasing them by 36% without the tour. The author advocates using multiple metrics like clicks, pageviews, and subjective user feedback to fully understand optimizations rather than relying solely on engagement metrics.