This is true sometimes, but if it's a design discussion and you're whiteboarding how something should be laid out, or even steps of what's completed and what's left, just a snapshot of the final state of the whiteboard is tremendously useful. It prevents the need for another person jotting down everything that was written up on the board.
Better than one's own jotting, in that the specific lettering and diagram shapes are linked to the presentation (though the cognitive processing involved in one's own jotting is also valuable).
a video/audio scrubber control that lets you go back and forth.
also another interesting thing about OneNote is that it can record audio, and embed a time index of the audio into everything that is being written,drawn or typed into a notebook. Currently it highlights what was done at that time index of the audio. but it could be used to show the exact state of page at any given time in the recording.
The Audio recording feature has been in onenote since 2003 SP1.
So basically if we just hosted the timelapse on Imgur...
MS already has something like this in OneNote, but I'm not sure how frequent the snapshots are. It's more of a revision history than a "watch every letter be written", IIRC.