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The issues you describe have nothing to do with "waterfall."

>Theyve already planned out their deliverables for the next 12 months and will be held accountable for meeting them.

Not sure I understand your point. Are you saying product roadmaps are incompatible with agile?

If they include detailed plans and timelines for feature deliveries then yes.

Agile doesn't mean "not planning" or even "vague planning".