A missed opportunity to not have all of these examples inline. The page/blog-post would be so much more convincing if it utilized all of these HTML replacements instead (or in addition) to linking to codepen.

Absolutely mind boggling. I've seen it many times before. There's some FooMaker v1.0 announced and you click on it thinking it will allow to easily make Foo and the example is how to disable FooMaker's lights l while AC is running or some other obscure edge case that affects like one in a million people, no examples how to actually use it for most common use case or how the result look like.