The author frames this as artificial complexity, and that's the best framing I've seen. The browser has a particular presentation philosophy and the more you try to cover it up, the more awkward your code becomes at the edges.
The killer application of LLMs is their ability to inform and adapt to a particular API, and analyze the code that you write. They are garbage at producing functionality for which they don't have a thousand examples, but provide documentation and intent and they will help you fill in the gaps. This is the real 10x opportunity, and the best part is that you can still write all the code yourself.
I'm certain this doesn't just apply to javascript and the web. I predict that the need for frameworks will slowly go away.