Where You Stand Depends On Where You Sit
This notion of the basis of all good discussions. It is also the basis of discussions that get us in trouble. For example, I sit in a FAR 34.2/DFARS 234.2 Federal Procurement paradigm and a similar paradigm for Enterprise IT based in ISO 12207, ITIL V3.1, CMMI, or similar governance processes.
Both these domains are guided by a Governance framework for spending other people's money, planning for that spend, performing the work with that money, reporting the progress to plan for that spend to produce the needed value, and taking corrective actions when the outcomes don't match the plan to increase the probability that the needed value (Capabilities) will be delivered for the planned cost to keep the Return On Investment on track.
This paradigm is independent of the software development method - traditional or agile.
If you work where the customer has a low need to know the cost, schedule, or what will be produced for the money, then you likely sit somewhere else.