A black box takes a question and returns an answer with nothing in between that a person can inspect. It may be accurate. It may not. From the outside there is no way to tell.
This opacity is tolerable for low-stakes tasks and unacceptable for consequential ones. When an output shapes a strategy, a budget, or a client recommendation, "trust me" is not an answer a leader can pass on.
The alternative is systems designed for transparency, traceability, and audit from the start.