3b justifies 3a, as well as that I have a much easier time paying attention to the talk. In video, there is too much temptation to play at 1.5x speed and aim for an approximate understanding. Though I guess watching the video together with other people also helps.
As for 3b, in my experience asking questions adds a lot of value, both for yourself as well as for other audience members. The fact that you have a question is a strong indication that the question is good and that other people are wondering the same thing.
3b justifies 3a, as well as that I have a much easier time paying attention to the talk. In video, there is too much temptation to play at 1.5x speed and aim for an approximate understanding. Though I guess watching the video together with other people also helps.
As for 3b, in my experience asking questions adds a lot of value, both for yourself as well as for other audience members. The fact that you have a question is a strong indication that the question is good and that other people are wondering the same thing.