This website is a valid JSON!
Check the source code. Instead of the habitual HTML and CSS, you will see just a plain JSON with the website's information.
WDR is a format to separate the website's information and design.
The website is readily available to be consumed outside the browser via JSON, but also still presentable to users accessing through the web browser.
While it seems nice in concept, it just isn’t compatible with much else on the web… What problem is this really fixing? I only see it making new problems.