[lifthrasiir]

> All the author did was replace traditional code blocks with an embed to a web playground (e.g. by s/Code/Playground/g in a MDX file).

Well, not surprising given that the article was about the web technology (which powers the application web, of course!). I might have been convinced otherwise.

There is indeed some negative feedback loop going here. But I think the cost to achieve interactivity has been decreasing over the time (compare with, say, 1990s' interactive CD) and the gap is still very significant, even with a very favorable condition (nowadays you can practically have interactivity anywhere anytime!). I'm happy to be proven wrong, but for now I'm not optimistic about that.