The first criticism with regard to using PPT is that it is not an especially high resolution method of data transmission compared with other transmitting visual evidence. Often times, as author suggested, people can read 300-1000 printed words in a minute whereas one slide of PPT can only contain far lesser number of words which results in poverty of content. I think it is true that PPT cannot convey number of words as much as in a paper, but it does not necessarily mean that it is content-free. If the presenter knows how to use PPT to supplement his speech rather than presenting it as isolated information, it might provide better comprehensibility to the audience. Besides, depending on how abstractive the topic could be, information contained in one slide might take more than 8 second to read.
Due to its distinctively cognitive style, the second criticism is that the PPT imposes on the audience and seeks to set up a dominance relationship between speaker and audience. From my point of view, blame on the style of PPT being relentlessly sequential-structured which is only good at advocacy but not analysis is overstated. Because whether or not the presentation is debatable completely depends on the goal of presenter. If the ultimate goal of presenters is to convince the audience, presentation will be aggressive, and PPT just one of the various tools to achieve that.
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