It's likely to be lighter than ChromeOS.

ChromeOS was a locked down userspace on top of Linux. Fuchsia gets rid of the Linux.

Linux was the only remotely useful, sane, and lightweight part of ChromeOS.

It was also the primary vector for security vulnerabilities.

Linux may be hacky, but it isn't exactly heavy.

I think this is a symptom of internal rivalries at Google. Seems like a combination of Dart (arch-rival to Go) and ChromeOS (arch-rival to Android).

That's not necessarily a bad thing -- Google's M.O. has always been to try lots of different things at once. But it may mean they literally don't have a solid long-term plan for it yet.

"arch-rivals"? That's overly dramatic. Go and Dart are hardly competing with each other, as are ChromeOS and Android.

I was being a little tongue-in-cheek, sure, but only slightly. They're both fairly recent languages, both representing a vision of how to fix the mistakes of the past. I'm sure the leaders of the teams see each other as rivals.