Isn't ChromeOS already largely there? Installing a full version of Debian is a couple clicks away from within ChromeOS (no developer mode or re-flashing needed)

Isn't ChromeOS already largely there? Installing a full version of Debian is a couple clicks away from within ChromeOS (no developer mode or re-flashing needed). You can run more or less whatever you'd like inside it, including GUI apps like GIMP or Firefox.