I might try a less dismissive way to say it.
The demo page, as it is currently, displays the DocC snippets feature as a way to embed full scripts or playgrounds, in documentation articles.
While useful, and thanks for that, this completely misses the need of documentation writers to edit their sample code for maximum documentation efficiency. This has been abundantly developed during the review. Documentation writers would love to have their documented sample codes compiled and checked, but the quality of the published document is more important.
This makes the demo page a kind of reminder of the current limitations of the DocC snippets feature. Even a page of this kind, full of medium-sized script-like sample codes, would profit from having a single occurrence of import Markdown in its copy (in the first snippet only).