I don't think your points apply to lectures like they do to meetings, at least for me. Meetings are more collaborative and most of my recall during a meeting is due to participation. If I'm not participating at all then I will most likely forget everything that happened during the meeting.

Lectures are different because I tend to use my notes as a way of interacting with the lecture (and usually you can't really interact much in a lecture unless it's a small class). Maybe it was my way of taking notes, but marking up lecture slides or essentially copying proofs/problems during an engineering or math lecture during my undergrad was most of my learning besides doing problem sets. Problem sets were very important, but they were only there to reinforce what I learned while taking my notes during the lecture. I ended up recalling much less whenever I didn't take notes and just tried to listen and participate as much as I could in the lecture.