Again, it was taught[1]. The fact that (speaking it with) one meter sounds particularly pleasant (to some people), and that this is a big part of its appeal (to those who like it) was not taught.

IOW, it's the difference between "these words in this poem rhyme" vs "this poem sounds nice because these words rhyme". Which, incidentally, is an analogy I make in the lightning talk to explain why this part would be glossed over: people assume that appreciation of rhyming/iambic pentameter is universal.

[1] "They taught that Shakespeare used iambic pentameter..." https://news.ycombinator.com/item?id=49378069