> A Chromebook with all three operating systems running at once is also darn useful for an ordinary Jane or Joe. For example, I can edit images using Linux GIMP and write with LibreOffice Writer while looking at pictures using Android Pinterest and simultaneously check my Gmail in Chrome OS. It's all good.

For example, I can edit images using Linux GIMP and write with LibreOffice Writer while looking at pictures using Firefox on Linux and simultaneously check my Gmail in Firefox on Linux. It's all good.

Maybe Pinterest is a poor example, but there are Android apps that offer functionality unavailable in Linux and Chrome. For example I used Word for Android to edit a Word document with suggestions and comments (could not do that in Office 365 apparently).

Actually I'm pretty sure there are many Android apps that offer functionality unavailable on Windows and OS X.

Also, it's nice to have the possibility to mess around with Debian in the VM, yet always have a browser available and with the best security.

Anbox[0] does exactly what Google made available for ChromeOS in reverse: it runs Android apps inside Linux containers.

[0]https://github.com/anbox/anbox