The point would be to run the browser directly on the hardware without any intervening useless layers like X-Windows or Wayland, then implement the desktop environment in that, and when you needed to pop up a browser window on the desktop (which you always need to do frequently), or an html app like you'd usually run in Electron, simply and efficiently use the same browser that's running the desktop environment, sandboxed the way all modern browsers now already implement their renderers isolated from their chrome ui frames.
No need to run the user's browsers separately inside a slower layer of emulation, when you already have a browser implementing the desktop.
Fewer layers and less bloaty software is better. We're already stuck with the browser, and it's not going away, so use it for everything. X-Windows and Wayland are obsolete and useless, so should be flushed.
