I don't think the world really works like that. Hearing an elevator pitch has a very different impact from reading a short-form business proposal. And of course the efficiency of the written word is not absolute; in lively discussions and debates, there is no time to put thoughts down into the written word; they had to be uttered. I am personally of the opinion that a successful university graduate should not only be able to write down their ideas in words but also be able to speak to defend their ideas.