This is a generic argument that can be used against any sort of proposed improvement. “If you don’t like the status quo, use something else”. It also comes off as defensive; I’m not sure if that’s what you intended or not.
> 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".