The point is that js has become a de facto way of rendering content, regardless of its nature, and in some cases this impacts usability and other non-functional requirements in ways that people don't always consider.

Obviously if a company wants tight control over their content then this may work to their benefit - although they may still find that their ability to render their own content requires non-trivial maintenance over time.

But that's a pretty narrow view of the web, and not everyone publishing on the web fits that model.