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Part of it is that watching a video takes the control of pace away from the consumer of that information. Whereas if you can read it, you can set the pace. Read it fast, read it slow, re-read important parts, highlight something and right-click google it, etc. Can't do all that with video.

Additionally, some people are aural learners, but others are visual. The latter generally have better synthesis and recall of things they read than things they hear. Such people likely prefer reading summaries than watching the video.

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