I notice the author mentioned "leave-behind Powerpoint decks." I had a short stint in consulting after getting my MBA, working with enterprise software clients. Within that job I've never once seen a Powerpoint deck that was useful after the fact unless you were in the room when the talk was given.

All it took for me to forget nearly everything I learned in business school communication classes was a seminar led by Edward Tufte, where it dawned on me that Powerpoint is no substitute for an appropriate executive summary of your content that can be passed around and referred to long after your talk is over.