I think this is a ridiculous thing to say. Don't think of the web as dev platform. Think of it as OpenGL or any other GL language. To create a game you need to use a graphics card which provides a primitive set of instructions but they can be empowered with the help of libraries. The web is the same. It provides a primitive set of functions that can be represented in a common way. They are still usable on their own but much more useful as part of frameworks.

Web technologies is for UI what opengl is for gaming.