I guess it turned out that non-professional website authors went with WYSIWYG editors (anybody remember Netscape Composer and Dreamweaver?) -- and today they've given up on entirely on creating their own site and just use hosted solutions like Facebook or Medium.
On the other hand, professional websites and their customers ended up deciding to create increasingly bulky, JS dependent monstrosities.
How can we get back to simple HTML websites without alienating users who've grown used to modern design, developers who insist on using Javascript even when it's unnecessary, and businesspeople who can't live without bars, videos, and ads?