Knowledge media face an awkward chasm between theories.
The old theory was naive transmissionism: "I'll convey this knowledge by telling you about it." That's effectively books' learning model.
But we know that model's wrong: learning is an active process of assimilation.
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Books, videos, etc. work great for learning, provided one chooses for oneself what to do and when, and can stop or switch anytime for any reason.
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Yes, those are valuable preconditions for learning in any medium, but it's just not the case that they reliably work great, even in that setting. Effective learning from a book requires tons of challenging metacognitive work—which is why works like How to Read a Book are popular.
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As effective as speech and writing can be, they can always be done poorly.
Good thread on the value of Feynman’s educational contribution:
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But, I agree there are important differences between media, and further improvements to make.
The ability to rewind, speed up, or skip around a lecture on YouTube makes it immensely better than a live lecture.