This is false. Many websites are using Javascript to render the websites in full to give the users a better experience, such as rendered a SPA (Single-Page-Application) to prevent unneeded amounts of data loaded on each page request and only load exactly what you need, to give a faster, smoother and higher quality experience for the user.
Sure the mom down the street who wants to blog about the her kitchen recipes wont be needing it, but a lot of websites "do"