[maxerickson]

It's likely to be lighter than ChromeOS.

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

[swiley]

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

[bitmapbrother]

It was also the primary vector for security vulnerabilities.

[ori_b]

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