A DAM archives the result. Play runs the process
In a DAM you upload what is already finished. The brief, the budget, the shoot calendar and who does what all live somewhere else: in email, in spreadsheets, and in a general-purpose project tracker. In Play a project starts as a structured brief, and the tasks, the calendar and the delivery queues come out of it.
One source of truth about where each piece stands, not only about where it ended up.