Personal Moats for the 21st Century: https://medium.com/@danielgross/your-personal-moats-f5221035338f#---24-281 …pic.twitter.com/cOSUu18Vh2
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Your argument against video seems mostly wrong to me. A large fraction of serious writing now has video or audio analogues - usually the author giving talks. In many cases (not all) the video is superior.
Of course, at most this would only slightly modify your point: paying lots of attention to serious video could also be part of a personal moat.