The idea of ChromeOS is simple: it's just enough Linux to get you online. It turns a PC into something akin to a tablet, with a full-screen icon-based app launcher. The desktop is very simple and vaguely Windows-like: there's a taskbar at the bottom, a file manager, drivers enough common hardware that most things just work out of the box, including a bunch of common GPUs, networking including Wi-Fi. In terms of apps, there's a built-in Google Drive client, and of course the Chrome web browser.

This is more or less describing one of the many immutable distros that only run programs with flatpaks. It's entirely feasible if someone wanted to make a distro with even less functionality, but why?