I suppose if people tread carefully, they can be used in a way that is beneficial. But a business consultant can relatively easily make these "things I've observed, and what I believe should be done about them" systems fairly easily.
What gives one person's anecdote based intuitive description system more validity than another's? Why for instance is the Riso-Hudson Ennegram anymore valid than @Zang 's metagram, or any of the other variations of the enneagram?
Unfortunately, saying the "right things" in a corporate environment, things that create a superficial instinctual reaction, will get you very far, even if there is no empirical basis for the things you say. She may have some empirical basis for what she says, but that aspect is not well advertised.