Dear Mr. Roth!
I will comment on your own contribution elsewhere, but thank you for your comments on mine.
Clearly, the video format allows us to revisit old problems in a new way - and just might make our ideas easier to digest. It is paradoxical, I think, but the discipline of physics is to reduce complex multidimensional ideas to simple mathematical formulae, but the efficient communication of those ideas is not necessarily working backwards from the formula to the original concepts. For some, the mathematical route is okay, but for others the mathematics is easier to understand if it follows a didactic, step-by-step presentation of the overall concept. In the end, both routes are essential, but these issues in fundamental physics are much too important to leave them to the mathematical whiz-kids.