[jacobr1]

Inability to drive internal decisions and/or CYA.

You can see it even more clearly with "consultancy." The reason consultancies can get away with using so many newly minted MBAs, is that what most of them do is just reflect back the to the company what their employees already knew, but in a form that is consumable and justifies the business case for that action.

There is some internal reason why the organization can't just make the decision, even though plenty of employees know what needs to get done. It could be weak leadership, inability to take risks, analysis paralysis, fear of unfamiliar territory, unwillingness to own the risk (CYA) and even more dysfunctional characteristics (like different teams unwilling to talk to each other). Brining in someone external can cut through much of that mess.