[bbvnvlt]

I actually hope more teachers go for the simple overhead option. I do, using an overhead webcam.

A physical overhead with the instructor's hand visible has been shown to work far better than presenting ready-made diagrams. It also works better than digital drawing, probably due to the natural inclusion of pointing gestures guiding students' attention [1].

There is also evidence (and good theoretical reasons to believe) that a transparent lightboard leads to unnecessary distraction/split attention. [2]

[1]: https://sci-hub.se/https://doi.org/10.1037/edu0000065

[2]: https://doi.org/10.1016/j.chb.2018.07.019