No. That's one type of slide. In others, the slides are there to present facts rather than numinous concepts. Think of illustrating something in programming: us

No. That's one type of slide. In others, the slides are there to present facts rather than numinous concepts. Think of illustrating something in programming: usually you need to show working code, and the audience need to be able to take and modify that specific code. Just talking about a concept is not enough for that specific case. Btw, there are people who hate "concept" slides just as much as you hate "content" slides. Feynman had some very terse comments on bullet points, for instance.