I can't see how this would be meaningfully different from ChromeOS. Google cannot force GNOME and KDE to stop clashing, there's no opportunity to "unify" the UI philosophy of Linux any better than the current efforts do. And upstream Linux has no big selling point for most users - the people that do care about that stuff will typically avoid Google's distro altogether.

If you want an upstream Linux kernel with folders of markdown prompts and virtualized ChromeOS/Android containers, just use Linux. You don't need to wait for Google to build that experience for you.