Data: sufficient for this task, not data in general
A dataset can be large, clean, and well-governed and still be the wrong data for the task sitting in front of it. Readiness is relative — a churn dataset that's perfect for identifying which customers are leaving may be missing the one field that would let you decide what to actually do about it.
The question worth asking isn't "do we have data." It's "do we have the specific slice of data — the right time window, the right segment, the right outcome label — that this particular task depends on."