More than anything this reminds me of the fact that HTML has failed on a basic level, to keep up with the ways that users want to experience content, and that designers want to present content. The browser has no real concept of "page navigation" or "site navigation" with any kind of state, or the "current" navigation item, or of hierarchy, breadcrumbs, menus, or other core navigational concepts involving site and page structure.

With a few built-in "site structure" features in the html standard, the browser could do a large part of what developers end up reimplementing over and over again - both with and without JS. A large part of "knowing about usability" is just knowing how to execute these basic navigation features without goofing up on the many pitfalls available to you.

For example, imagine if there was some kind of Site Structure standard, or Page Structure standard. The browser could then generate standardized navigation elements with perfect UX on every platform, and sure, you can style them, but the basic functionality just works everywhere without having to make advanced javascript/html/css menus that take into account concepts like responsiveness, touch interface, or accessibility.