I found at uni that well-prepared blackboard/overhead lectures were excellent for taking notes. I caught many small typos and misunderstandings as I would actively work through each step of the theorem/proof/problem as I wrote.

In hindsight I realized they must have spent a great deal of effort in preparing the lectures precisely such that they were easy to write down.

In contrast, the PowerPoint lectures we had was exactly like you describe. Either I could focus on writing stuff down, but then I couldn't really follow what they were saying, or I could focus on what they were saying but not write anything down. Either way I felt I was missing out, as writing stuff down made stuff stick magnitudes better.

I attributed this to the fact that PowerPoint doesn't lend itself to be easily transferred to notes, so it requires a transcription step that detracts from the lessons.