I would argue it goes against the desires of the open source world.

ChromeOS is a product designed to suck people further in to the Google ecosystem. All its limitations, like basically being a web browser with access to the Android Play store, are built around that. The simplicity of not having to worry about anything else is how Google sells that as a benefit of their platform to the masses.

I don't know any of my fellow nerds who want a ChromeOS kind of experience, so why would any of us dedicate our free time to making one?