But what alternatives are really left behind here that you view as superior?
To me, it is obvious the entire world sees a very high value in how much power can be delivered in a tiny payload via networked JS powering an HTML/CSS app. Are there really other things that can be viewed as equally powerful to HTML which are also able to pack such an information dense punch?
Er, no. Go watch some major site load.
I think you and I both know a 200kB gzipped web app can be a very powerful tool, so I don't understand what angle you're approaching this from.
I guess there is stuff like SquareSpace. No idea how good it is though. And FrontPage back in the day but that sucked.
The ability to drop components in and then move the window around and have them respond as they will in the live program was peak WYSIWYG UI editing. I have not experienced better and I doubt I will.