Programming languages, a domain that does not have deep established cultural history, quickly adopted syntax formatting and highlighting, because those things are better for readability. Math notation has a much deeper cultural history, and also did a similar thing: math notation is inherently a very 2D language, because that's better for readability. I think it's reasonable to believe that the underlying advantages of these styles are likely also at least sometimes true for written text. Prose is one-dimensional because we historically have such a strong tradition of wanting spoken text and written text to correspond to each other. Now, we get an opportunity to re-evaluate that convention, and we discover that patterns other than one-dimensional linear prose are more reader-friendly, of which bullet points are a major one. I think this is all a healthy development.