Sitting and watching is still just sitting and watching...
"It was in the webinar!" is just as ineffective as saying "It was in the lecture!"
Video is but a singular tool for educators, and better yet our students, to utilize in the pursuit of greater knowledge. I'm sure our lectures (video and live) are wonderful, but if it does not result in action(s) that cause a learner to go beyond regurgitating to you what you said, then what is the point?