> I often wonder how many of them could actually speak at depth, extemporaneously, about the subect of their talk or if their actual knowledge collides with the

> I often wonder how many of them could actually speak at depth, extemporaneously, about the subect of their talk or if their actual knowledge collides with the end of their slides. Was not my experience at CppCon at least. In fact, the problem is usually that they are pretty pedestrian presenters and/or run out of time. But most clearly know what they are talking about. Maybe this is different at other conferences though.