[on_and_off]

Not an expert on ChromeOS but it has more than simply Chrome right now, for example it can run Android apps.

It is although true that Google could replace the low layers of Chrome OS as long as it replicates most of the user facing features.

If Google intends to make Fuchsia some kind of Android successor (we have no way to know if that's the plan though), this feature is utterly needed anyway : an Android VM for 'legacy' apps and Flutter for the future.