you don't understand chromebooks. they exist to provide a zero-maintenance cloud-only (mostly) device. android isn't that since it has local installs and "native" applications.
You don't understand Chromebooks, or Android. Like Android, Chromebooks run a stripped-down Linux distribution designed for simplicity. If Chrome for Android were worth a crap, and if you had Android boot right into it and didn't give any options to get out of it, then it would be like a Chromebook in every way that mattered; all the rest would be details.