[MawKKe]

When I took a "presentation skills" course at Uni, they taught us that humans are very bad at reading and listening at the same time. Something about the brain regions utilized by these two activities overlap, and cannot be simultaneously be processing two different things. For this reason the visual portion of a presentation (slides) should be kept minimal and act as immediate support for the vocal portion of the presentation. If the two are not "in sync" the audience is unable to follow the presentation fully.

I think 3b1b videos constantly break this rule; there is a LOT of going on visually, while the narrator is talking non-stop about some loosely related things or trivia. More often than not I have to re-watch segments multiple times because I cannot understand what the hell am I supposed to be paying attention to.