HTML isn't legacy cruft, it's an essential part of the web that will never go away. If you want to ship an app with no HTML, then use a different platform.
> 3. Design to execute within and integrate well with the existing Web platform:
> * execute in the same semantic universe as JavaScript
> * access browser functionality through the same Web APIs that are accessible to JavaScript
Lawyering aside, I would say that this is pretty much the same thing as "enabling the development in web apps in other languages".