In many organizations, the responsibilities of Product Manager and Product Owner are happily overlapping. When responsibilities are similar, there is a risk that tasks become so unclear that something essential remains to be done.
One ultimatum of agile methods is to make projects unnecessary. But what does this mean? Will we not try to finish anything anymore? Or do we not need a plan for work anymore? If successful, the agile method is better in both respects: it helps us achieve more and plan more efficiently.