If you use them raw, yes. They are just the building block you can build upon. And that's a really good building block. You can create your own parsers. I am doing exactly this for a framework that has yet to be released, full disclosure. Makes html clearly html, and javascript fully javascript. No bastardization of either one into a chimera. And the junction of the two is why the custom parser is required. But it is really light from a dev experience.