One time I was watching Gen. Patraeus give a press conference by first giving a brief involving a lot of slides. One slide particularly stood out because it was so incomprehensible. It had arrows flying every which way, some pointing indistinctly at nothing in particular. Different kinds of arrows, blobs in clouds, starbursts, etc. The general was stumbling a bit in his words and he looks up, eyeballs the audience, and thanks the help he got from Microsoft employees in constructing that slide. That answers why it was incomprehensible but not why MS employees were helping him.
Pooperpoint slides encourage a sort of mindless creativity that has no real purpose. This has stupefied many an organization via flows of information that start down in the trenches as being real information. By the time it reaches bullet points for the generals, it has been morphed into disinformation. It actually makes the organization dumber by encouraging the sort of people who demand bullet pointed idiocy to rise to a position they should never hold. At that point, they are merely bullet point consumers and producers, a sort of mutual recursive backscratching moron class that do their best job when they do nothing.