The traditional lecture does have a lot of value, however, we are also quite certain that the instructional experience can be improved through the addition of visualizations and simulations. This is especially true for interactive visualizations where the learner can ask, "What if ...", experiment, and see the results of their interactions.
The lecture format is very old and would not have persisted if it didn't provide a good value. At the same time, it's age also implies that there is room for improvement.
The vast majority of students never ask, “what if…” The vast majority just want to know the mechanics of doing the problems well enough to pass the test. At the time a student is taking Calculus 1 they don’t ask questions about why it works. They just want to know, for instance, the rules of differentiation. Later in life, when they have intellectually matured, videos like 3Blue1Brown are interesting and fascinating. The vast majority of students would not learn well from 3Blue1Brown type videos.
The lecture format has only been competing with high-production-values video for a decade or two, and with interactive examples for much less than that.
The lecture format is very old and would not have persisted if it didn't provide a good value. At the same time, it's age also implies that there is room for improvement.