The parent comment was talking about educational lectures, like in classroom settings. When I was in college, online ed was just taking off at my campus, and I

The parent comment was talking about educational lectures, like in classroom settings. When I was in college, online ed was just taking off at my campus, and I took one CS class with online lectures. It was quite useful to be able to go back to a lecture in that situation. I agree that for traditional meetings/conferences they're not super useful (though I often find myself enjoying presentations from tech conferences long after the conference was held). But that was a different scenario than I was defending.