Note that while ChromeOS is really really nice, beautiful and intuitive, it has like no support for running apps normally. You get Android apps and Debian in a container.
The performance sucks, you should setup unattended-upgrades.
But yeah, after that it could be great. If they never touch the terminal they cant break anything.
And while you can run Android and debian browsers (I tried Android Mull and Brave, and Debian Firefox and Brave both from their official repos), Chrome is always there and mostly the default I think.