The future of HTML/CSS and hopefully JavaScript is, that it no longer used and replaced by a new technology stack.

Especially CSS is such a miss fitting technology for what it is used today, that web frameworks actively fight it, by trying to keep its scope to components.

When looked at web tech from a distance, it is cristal clear to me that we need something new.

Instead of all the abysmal complicated rules of CSS, we would probably be much better served by something like ElmUI (a modern advanced version of the idea) + some scripting for dynamic things.

"Some scripting for dynamic things" will never satisfy the "everything must be an SPA" crowd, unfortunately.

CSS has warts, true, but you are not forced to use them. Modern CSS can be brief and clean.