Thank you for your continuing deep engagement in this conversation Bryan…I really appreciate that so many folks have contributed so much of their time to this discussion.
Your point about text vs other media is well-taken. As for Hypothesis, basically anything is possible within an annotation: one can make a note with videos, pictures, text, equations, etc. But at least with Hypothesis, there is less ability so far to anchor annotations in media other than text. One worthy experiment is Jon Udell’s demonstration of how video/audio timelines can be annotated via their transcripts: https://blog.jonudell.net/2018/06/12/annotating-on-and-with-media/