A key to agile development is frequent feedback loop. Based on the feedback product manager can determine whether to make a course correction or continue on its course. Without feedback, PM won't be able to find out whether they have a right product market fit until product has been implemented and launched.
One implicit assumption about frequent course corrections is that as product owner PM will be able to steer the product development ship to the right orientation to get to the goal the fastest. Without PM's ability to keep their eyes on their original goal, all the feedback and subsequent changing tack will matter a little to shorten the product development cycle.
One implicit assumption about frequent course corrections is that as product owner PM will be able to steer the product development ship to the right orientation to get to the goal the fastest. Without PM's ability to keep their eyes on their original goal, all the feedback and subsequent changing tack will matter a little to shorten the product development cycle.