I feel like many people here are misreading the OP as anti-framework and I didn’t read it that way at all. Sure, there is an element of, “you don’t need to immediately grab the nearest framework as the solution to _every_ problem”, and that’s something I personally agree with.

But the point I think the author is trying to make is that whether you do or don’t use a framework, you need to understand the fundamentals. The fundamental language of a browser has always been HTML. JavaScript and CSS are great and came along in due time but before all that there was HTML. So whether you’re simply marking up a document or building a full-fledged web app with React or Vue, you’re doing yourself a disservice by not learning and using proper HTML.