Its worse than that. In many companies, a slick powerpoint presentation weighs far more than thoughtful analysis. I've done the experiment and presented the same recommendations based on the same logic in two ways. The concise email got a 'good idea we should think about that' - the powerpoint three weeks later (same words, nothing in the business had changed) got a 'brilliant work we need to drop everything and do that now'.

These are smart and capable people too. They're just somehow got this deep bias about only pretty powerpoint could be important.