> Long meeting times with the wrong people in the meeting? That's a managerial issue and has nothing to do with scrum.

If scrum tends to lead with long meeting times with the wrong people then scrum certainly should include safeguards against that. Otherwise we need "x+scrum" framework which includes these safeguards. I don't think scrum should fix every problem "in management", but "meeting management" should be a core scrum issue to deal with.