Sadly, yes.

There are managers who refuse to listen to their own people. This is where MBB consultants come in: talk to everyone, listen, and deliver fancy brochure-level template presentations with data and input from their own employees. It's the same or variations of recommendations that are listened-to because they cost more.

Also, an ignorant of the politics and business generalist business expert can more easily notice if there is anything amiss by entering as a novice with fewer vested interests.